CN102798143A - Ceramic igniter and making method thereof - Google Patents
Ceramic igniter and making method thereof Download PDFInfo
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- CN102798143A CN102798143A CN2012103179476A CN201210317947A CN102798143A CN 102798143 A CN102798143 A CN 102798143A CN 2012103179476 A CN2012103179476 A CN 2012103179476A CN 201210317947 A CN201210317947 A CN 201210317947A CN 102798143 A CN102798143 A CN 102798143A
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Abstract
The invention relates to a ceramic igniter and a making method thereof. The ceramic igniter comprises a ceramic basal body, a heating wire and an electrode, wherein the heating wire and the electrode are arranged in the ceramic basal body; one end of the electrode is connected with the heating wire, and the end surface of the other end of the electrode is exposed on the end surface of one end of the ceramic basal body and welded with a wire; and the ceramic basal body is a compound ceramic basal body made from various materials, and main phases are silicon nitride and molybdenum disilicide. According to the invention, because the compound ceramic basal body contains molybdenum disilicide, even when the utilization temperature is higher than 1300 DEG C, the surface also cannot be oxidized so as to effectively prolong the service life of the ceramic igniter of the invention; and because the compound ceramic basal body contains silicon nitride, besides outstanding high temperature oxidization resistance, the compound ceramic basal body also has the advantages of high strength, no deformation at high temperature, good impact resistance, no damage in transportation or utilization, excellent comprehensive performance and the like.
Description
Technical field
The present invention relates to a kind of igniter, particularly relate to a kind of ceramic igniter and manufacturing approach thereof.
Background technology
The igniter that uses at present comprises silicon nitride igniter and carborundum igniter. silicon nitride igniter is made up of matrix, heating wire and electrode, and matrix is processed blank sintering by single silicon nitride composition and formed, and has working strength height, advantage that shock resistance is good; The carborundum igniter does not contain heating wire, processes blank sintering by single carborundum composition and forms, and matrix heating itself has the good advantage of high-temperature oxidation resistance.Yet the high-temperature oxidation resistance of the matrix of silicon nitride igniter is relatively poor, and when serviceability temperature surpassed 1300 ℃, its surface will oxidation, thereby had shortened the service life of silicon nitride igniter; And the serviceability temperature of the matrix of carborundum igniter can surpass 1300 ℃, but its intensity is lower, and shock resistance is poor, in transportation and more fragile in using.
Summary of the invention
The objective of the invention is to above-mentioned existing problems and deficiency, provide that a kind of high-temperature oxidation resistance is good, intensity is high, shock resistance good, the ceramic igniter of long service life and manufacturing approach thereof.
Technical scheme of the present invention is achieved in that
Ceramic igniter of the present invention; Comprise ceramic matrix and place heating wire and the electrode in the ceramic matrix; One end of wherein said electrode is connected with heating wire; The end face of its other end exposes on the end face of ceramic matrix one end and through the mode of welding and is connected with lead, is characterized in that said ceramic matrix is the composite ceramics matrix of silicon nitride and molybdenum disilicide for its main thing that is formed by multiple different materials mixing manufacture mutually.
In order to make the present invention in the process of making; Grinding easily of the electrode tip that is used for being connected with lead; And economical with materials, an end of above-mentioned ceramic matrix is provided with the U-shaped opening, and the end that above-mentioned electrode is connected with lead places in the ceramic matrix of these U-shaped opening both sides.
Be connected reliably in order to make between electrode of the present invention and the heating wire, to reach the effect of better transmission electric energy, above-mentioned heating wire is that one is connected with electrode.
In order to make heating wire of the present invention more tight with contacting of ceramic matrix, both helped strengthening the intensity of ceramic matrix, the heat conduction that helps heating wire again is more even, and above-mentioned heating wire is arranged to spiral surrounding curve-like structure.And the curved even distribution in ceramic matrix of the heating wire of said spiral surrounding curve-like structure, and the heating wire of said spiral surrounding curve-like structure comprises that several continuous U-shapeds are crooked.
The manufacturing approach of ceramic igniter of the present invention comprises the steps:
A, powder preparation
65～87% weight silicon nitride powders, 5～20% weight molybdenum silicide powders, 5～10% weight yittrium oxide powder, 3～5% weight alumina powders are mixed; Put into sand mill; And in powder weight: deionized water weight=1: the ratio of (1～1.5) adds deionized water; Mix after 6～12 hours, slip was put into 120 ° of C of drying box dry 6 hours down, dried powder is crossed 80 mesh sieves and is stored for future use;
B, green compact preparation
At first weighing is put into metal pattern with the powder that weighs up then, and wipes powder off back and put into press together with metal pattern; 500 kg/cm of exerting pressure; Make the powder formation in the metal pattern be with a groove and an end to have the green compact of U-shaped opening, the shape of the shape of groove and heating wire and electrode matches, and then heating wire and electrode is put into groove; Cover a slice green compact again, form a green compact assembled unit;
The preparation of C, graphite press strip and graphite septum
According to graphite press strip and the graphite septum that the length and width sized of green compact matches, the surfaces coated boron nitride interleaving agent that graphite press strip and graphite septum contact with green compact;
D, the dress mould, fire, split
Respectively put a graphite press strip up and down at each green compact assembled unit; And form row by several green compact assembled units, with the graphite septum isolation, then multiple row green compact assembled unit is put into framed fixing between row and the row; Send into vacuum hotpressing stove then and carry out hot pressed sintering; Burn the back form removal, split by each green compact assembled unit, just can obtain a main thing is the composite ceramics matrix of silicon nitride and molybdenum disilicide mutually;
E, welding lead
Grind the electrode of the U-shaped openend of composite ceramics matrix, the mode through welding links together lead and electrode then, promptly forms ceramic igniter of the present invention.
Wherein, the specific practice of the hot pressed sintering described in the above-mentioned steps D is following:
The intensification pressurization schedule:
Room temperature to 1600 ℃: at the uniform velocity heat up, at the uniform velocity pressurization, furnace temperature rose to 1600 ℃ in 90 minutes, and press pressure adds to 25 tons, 1600 ℃ of insulations, pressurize 30 minutes;
1600 ℃ to 1780 ℃: at the uniform velocity heat up, at the uniform velocity pressurization, furnace temperature rose to 1780 ℃ in 40 minutes, and press pressure adds to 40 tons, 1780 ℃ of insulations, pressurize 30 minutes;
The atmosphere system:
Keep vacuum state before 1600 ℃ in the hot pressing furnace, temperature charges into nitrogen when reaching 1600 ℃, decomposes with the elevated temperature heat that prevents silicon nitride powder.
It is the structure of the composite ceramics matrix of silicon nitride and molybdenum disilicide mutually that the present invention adopt multiple material mixing to make to form ceramic matrix main thing dexterously; Owing to contain the molybdenum disilicide composition in this composite ceramics matrix; Its high-temperature oxidation resistance obviously is superior to the matrix of existing silicon nitride igniter; Even therefore its serviceability temperature surpasses 1300 ℃, the phenomenon of oxidation can not appear in its surface yet, thereby has prolonged the service life of ceramic igniter of the present invention effectively; Again owing to contain the silicon nitride composition in this composite ceramics matrix; Make it on basis, have advantages such as intensity height, high temperature is indeformable, shock resistance is good again, in transportation and not fragile in using with good high-temperature antioxygenic property.Therefore, ceramic igniter of the present invention has overcome the existing shortcoming of existing carborundum igniter again when having overcome the existing shortcoming of existing silicon nitride igniter, and its combination property is superior.
Below in conjunction with accompanying drawing the present invention is further described.
Description of drawings
Fig. 1 is a cross-sectional view of the present invention.
Fig. 2 is the internal structure sketch map of green compact described in the present invention.
Fig. 3 is the cross-sectional view of green compact assembled unit described in the present invention.
The specific embodiment
Like Fig. 1-shown in Figure 3; Ceramic igniter of the present invention; Comprise ceramic matrix 1 and place the heating wire 2 and electrode 3 in the ceramic matrix 1, wherein an end of electrode 3 is connected with heating wire 2, and the end face of its other end exposes on the end face of ceramic matrix 1 one ends and through the mode of welding and is connected with lead 4; And ceramic matrix 1 is the composite ceramics matrix of silicon nitride and molybdenum disilicide for its main thing that is formed by multiple different materials mixing manufacture mutually; This composite ceramics matrix is fine and close structural member, can completely cut off outside air effectively and contact with the interior heating wire 2 of composite ceramics matrix, and ceramic matrix 1 is a flat rectangle ceramic matrix.In order to make the present invention in the process of making, grinding of the electrode tip that is used for being connected with lead 4 is easy, and economical with materials, and an end of ceramic matrix 1 is provided with U-shaped opening 5, and the end that electrode 3 is connected with lead 4 places in the ceramic matrix 1 of these U-shaped opening 5 both sides.As shown in the figure; Electrode 3 is made up of positive and negative electrode; Wherein an end of positive electrode is connected with a wherein end of heating wire 2, and an end of negative electrode is connected with the other end of heating wire 2, and the other end of positive electrode places in the silicon nitride matrix 1 of U-shaped opening 5 one sides; The other end of negative electrode places in the silicon nitride matrix 1 of U-shaped opening 5 opposite sides, and the end that positive and negative electrode is exposed to silicon nitride matrix 1 end face is connected with a lead 4 separately.Be connected reliably in order to make between electrode 3 of the present invention and the heating wire 2, to reach the effect of better transmission electric energy, heating wire 2 is connected for one with electrode 3.In order to make heating wire 2 of the present invention more tight with contacting of ceramic matrix 1; Both helped strengthening the intensity of ceramic matrix 1; The heat conduction that helps heating wire 2 again is more even; Heating wire 2 is arranged to spiral surrounding curve-like structure, and the curved even distribution in ceramic matrix 1 of the heating wire 2 of this spiral surrounding curve-like structure, and the heating wire 2 of this spiral surrounding curve-like structure comprises that several continuous U-shapeds are crooked simultaneously.
The manufacturing approach of ceramic igniter of the present invention comprises the steps:
A, powder preparation
65～87% weight silicon nitride powders, 5～20% weight molybdenum silicide powders, 5～10% weight yittrium oxide powder, 3～5% weight alumina powders are mixed; Put into sand mill; And in powder weight: deionized water weight=1: the ratio of (1～1.5) adds deionized water; Mix after 6～12 hours, slip was put into 120 ° of C of drying box dry 6 hours down, dried powder is crossed 80 mesh sieves and is stored for future use;
B, green compact preparation
At first weighing is put into metal pattern with the powder that weighs up then, and wipes powder off back and put into press together with metal pattern; 500 kg/cm of exerting pressure; Make the powder formation in the metal pattern be with a groove 6 and an end to have the green compact 7 of U-shaped opening 5, the shape of the shape of groove 6 and heating wire 2 and electrode 3 matches, and then heating wire 2 and electrode 3 is put into groove 6; Cover a slice green compact 7 again, form a green compact assembled unit;
The preparation of C, graphite press strip and graphite septum
According to graphite press strip and the graphite septum that the length and width sized of green compact 7 matches, the surfaces coated boron nitride interleaving agent that graphite press strip and graphite septum contact with green compact 7;
D, the dress mould, fire, split
Respectively put a graphite press strip up and down at each green compact assembled unit; And form row by several green compact assembled units, with the graphite septum isolation, then multiple row green compact assembled unit is put into framed fixing between row and the row; Send into vacuum hotpressing stove then and carry out hot pressed sintering; Burn the back form removal, split by each green compact assembled unit, just can obtain a main thing is the composite ceramics matrix of silicon nitride and molybdenum disilicide mutually;
E, welding lead
Grind the electrode 3 of the U-shaped openend of composite ceramics matrix, the mode through welding links together lead 4 and electrode 3 then, promptly forms ceramic igniter of the present invention.
Wherein, the specific practice of the hot pressed sintering described in the above-mentioned steps D is following:
The intensification pressurization schedule:
Room temperature to 1600 ℃: at the uniform velocity heat up, at the uniform velocity pressurization, furnace temperature rose to 1600 ℃ in 90 minutes, and press pressure adds to 25 tons, 1600 ℃ of insulations, pressurize 30 minutes;
1600 ℃ to 1780 ℃: at the uniform velocity heat up, at the uniform velocity pressurization, furnace temperature rose to 1780 ℃ in 40 minutes, and press pressure adds to 40 tons, 1780 ℃ of insulations, pressurize 30 minutes;
The atmosphere system:
Keep vacuum state before 1600 ℃ in the hot pressing furnace, temperature charges into nitrogen when reaching 1600 ℃, decomposes with the elevated temperature heat that prevents silicon nitride powder.
Behind the hot pressed sintering EO, temperature is cooled to 20 ℃ in the stove.
The present invention describes through embodiment; But the present invention is not constituted restriction, with reference to description of the invention, other variations of the disclosed embodiments; Professional person as for this area expects that easily such variation should belong within the scope thereof of the present invention.
Claims (8)
1. ceramic igniter; Comprise ceramic matrix (1) and place heating wire (2) and the electrode (3) in the ceramic matrix (1); One end of wherein said electrode (3) is connected with heating wire (2); The end face of its other end exposes on the end face of ceramic matrix (1) one end and through the mode of welding and is connected with lead (4), it is characterized in that said ceramic matrix (1) is the composite ceramics matrix of silicon nitride and molybdenum disilicide for its main thing that is formed by multiple different materials mixing manufacture mutually.
2. according to the said ceramic igniter of claim 1, it is characterized in that an end of above-mentioned ceramic matrix (1) is provided with U-shaped opening (5), the end that above-mentioned electrode (3) is connected with lead (4) places in the ceramic matrix (1) of these U-shaped opening (5) both sides.
3. according to the said ceramic igniter of claim 1, it is characterized in that above-mentioned ceramic matrix (1) is a flat rectangle ceramic matrix.
4. according to the said ceramic igniter of claim 1, it is characterized in that above-mentioned heating wire (2) is connected for one with electrode (3).
5. according to the said ceramic igniter of claim 1, it is characterized in that above-mentioned heating wire (2) is arranged to spiral surrounding curve-like structure.
6. according to the said ceramic igniter of claim 5; It is characterized in that heating wire (2) curved even distribution in ceramic matrix (1) of above-mentioned spiral surrounding curve-like structure, and the heating wire (2) of said spiral surrounding curve-like structure comprises that several continuous U-shapeds are crooked.
7. the manufacturing approach of a ceramic igniter, this method are used for making as the described ceramic igniter of aforementioned arbitrary claim, it is characterized in that comprising the steps:
A, powder preparation
65～87% weight silicon nitride powders, 5～20% weight molybdenum silicide powders, 5～10% weight yittrium oxide powder, 3～5% weight alumina powders are mixed; Put into sand mill; And in powder weight: deionized water weight=1: the ratio of (1～1.5) adds deionized water; Mix after 6～12 hours, slip was put into 120 ° of C of drying box dry 6 hours down, dried powder is crossed 80 mesh sieves and is stored for future use;
B, green compact preparation
At first weighing; Then the powder that weighs up is put into metal pattern; And wipe powder off back and put into press together with metal pattern, 500 kg/cm of exerting pressure make the powder formation in the metal pattern be with a groove (6) and an end to have the green compact (7) of U-shaped opening (5); The shape of the shape of groove (6) and heating wire (2) and electrode (3) matches; Then heating wire (2) and electrode (3) are put into groove (6), cover a slice green compact (7) again, form a green compact assembled unit;
The preparation of C, graphite press strip and graphite septum
According to graphite press strip and the graphite septum that the length and width sized of green compact (7) matches, the surfaces coated boron nitride interleaving agent that graphite press strip and graphite septum contact with green compact (7);
D, the dress mould, fire, split
Respectively put a graphite press strip up and down at each green compact assembled unit; And form row by several green compact assembled units, with the graphite septum isolation, then multiple row green compact assembled unit is put into framed fixing between row and the row; Send into vacuum hotpressing stove then and carry out hot pressed sintering; Burn the back form removal, split by each green compact assembled unit, just can obtain a main thing is the composite ceramics matrix of silicon nitride and molybdenum disilicide mutually;
E, welding lead
Grind the electrode (3) of the U-shaped openend of composite ceramics matrix, the mode through welding links together lead (4) and electrode (3) then, promptly forms ceramic igniter of the present invention.
8. according to the manufacturing approach of the said ceramic igniter of claim 7, it is characterized in that the specific practice of the hot pressed sintering described in the above-mentioned steps D is following:
The intensification pressurization schedule:
Room temperature to 1600 ℃: at the uniform velocity heat up, at the uniform velocity pressurization, furnace temperature rose to 1600 ℃ in 90 minutes, and press pressure adds to 25 tons, 1600 ℃ of insulations, pressurize 30 minutes;
1600 ℃ to 1780 ℃: at the uniform velocity heat up, at the uniform velocity pressurization, furnace temperature rose to 1780 ℃ in 40 minutes, and press pressure adds to 40 tons, 1780 ℃ of insulations, pressurize 30 minutes;
The atmosphere system:
Keep vacuum state before 1600 ℃ in the hot pressing furnace, temperature charges into nitrogen when reaching 1600 ℃, decomposes with the elevated temperature heat that prevents silicon nitride powder.
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| CN2012103179476A CN102798143A (en) | 2012-08-31 | 2012-08-31 | Ceramic igniter and making method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103024954A (en) * | 2012-12-10 | 2013-04-03 | 冷水江市明玉陶瓷工具有限责任公司 | Silicon nitride composite ceramic heating element materials and preparation method thereof |
| CN109437941A (en) * | 2018-11-08 | 2019-03-08 | 中国科学院上海硅酸盐研究所 | A kind of high intensity, high temperature resistant, hot knife of silicon nitride ceramics of heat shock resistance and its preparation method and application |
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| WO2007130658A2 (en) * | 2006-05-04 | 2007-11-15 | Saint-Gobain Ceramics & Plastics, Inc. | Ceramic heating elements |
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| CN103024954A (en) * | 2012-12-10 | 2013-04-03 | 冷水江市明玉陶瓷工具有限责任公司 | Silicon nitride composite ceramic heating element materials and preparation method thereof |
| CN109437941A (en) * | 2018-11-08 | 2019-03-08 | 中国科学院上海硅酸盐研究所 | A kind of high intensity, high temperature resistant, hot knife of silicon nitride ceramics of heat shock resistance and its preparation method and application |
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Application publication date: 20121128 |