JP3152677B2 - Crucible with thermal shock resistance - Google Patents
Crucible with thermal shock resistanceInfo
- Publication number
- JP3152677B2 JP3152677B2 JP12169591A JP12169591A JP3152677B2 JP 3152677 B2 JP3152677 B2 JP 3152677B2 JP 12169591 A JP12169591 A JP 12169591A JP 12169591 A JP12169591 A JP 12169591A JP 3152677 B2 JP3152677 B2 JP 3152677B2
- Authority
- JP
- Japan
- Prior art keywords
- crucible
- thermal shock
- shock resistance
- present
- outer diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Crucibles And Fluidized-Bed Furnaces (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は耐熱衝撃性に優れたルツ
ボ、特にアルミナルツボに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crucible excellent in thermal shock resistance, and particularly to an alumina crucible.
【０００２】[0002]
【従来の技術】一般に、高純度アルミナルツボは、例え
ばリン酸塩を原料とする腐食性の材料を溶融するために
使用されており、特に少量のガラス原料を溶融するため
のルツボとして使用されている。2. Description of the Related Art In general, high-purity alumina crucibles are used for melting corrosive materials made of, for example, phosphates, and are particularly used as crucibles for melting a small amount of glass materials. I have.
【０００３】通常、ガラス原料は、アルミナルツボに入
れ、これを、先ず、５００℃以下の温度に制御された電
気炉に装入した後、電気炉の温度を徐々に上昇させ、１
０００〜１５００℃の温度で溶融させている。従来使用
されているアルミナルツボの場合、この溶融工程時間を
短縮しようとして、予め１０００℃に昇温した電気炉に
室温から直にアルミナルツボを装入すると、熱衝撃によ
りアルミナルツボが割れ、そこからガラス融液がしみだ
し、電気炉の断熱材やヒーターなどを損傷することがあ
る。[0003] Usually, a glass raw material is placed in an alumina crucible, which is first charged into an electric furnace controlled at a temperature of 500 ° C or less, and then the temperature of the electric furnace is gradually increased to 1
It is melted at a temperature of 000 to 1500 ° C. In the case of a conventionally used alumina crucible, when the alumina crucible is charged directly from room temperature into an electric furnace heated to 1000 ° C. in advance in order to shorten the melting process time, the alumina crucible is cracked by thermal shock, and The molten glass may seep out and damage the insulation and heaters of the electric furnace.
【０００４】[0004]
【発明が解決しようとする課題】すなわち、従来のアル
ミナルツボは、急激に高温に供されたとき、それに加わ
る熱衝撃により損傷を受けやすいものであった。したが
って、本発明の課題は、急激に高温に供された場合でも
破損しないような高い耐熱衝撃性を有するルツボを提供
することである。That is, conventional alumina crucibles are susceptible to damage due to thermal shock applied thereto when exposed to a high temperature rapidly. Therefore, an object of the present invention is to provide a crucible having high thermal shock resistance such that the crucible does not break even when subjected to a sudden high temperature.
【０００５】[0005]
【課題を解決するための手段】本発明によれば、上記課
題は、球面を構成する底部と、この底部に連接された逆
中空截頭円錐体からなる胴部とを有し、該底部の上端の
外径は、該胴部の開口端の外径の０．８倍以上１倍未満
の大きさであり、該胴部は、その開口端から該底部にか
けてテーパ−を有し、厚さが、１．２〜１．６ｍｍの範
囲内にあることを特徴とする耐熱衝撃性に優れたアルミ
ナルツボによって解決される。SUMMARY OF THE INVENTION According to the present invention, an object of the present invention is to have a bottom having a spherical surface and a body consisting of an inverted hollow frustoconical body connected to the bottom. The outer diameter of the upper end is 0.8 times or more and less than 1 time the outer diameter of the open end of the body, and the body has a taper from the open end to the bottom, and has a thickness. Is within the range of 1.2 to 1.6 mm, which is solved by an alumina crucible excellent in thermal shock resistance.
【０００６】[0006]
【作用】本発明の如く、特に胴部にテーパーを設け、厚
さを所定の範囲に規定することにより、耐熱衝撃性が向
上する。According to the present invention, the thermal shock resistance is improved by providing a taper in the body portion and defining the thickness in a predetermined range.
【０００７】[0007]
【実施例】以下、本発明を図面を参照してさらに詳しく
説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings.
【０００８】図１は、本発明の一実施例によるアルミナ
ルツボを示す断面図である。図１に示すルツボ１０は、
球面を構成する底部１２と、この底部１２に連設された
逆中空截頭円錐体からなる胴部１１とによって構成され
ている。ルツボ１０の厚さは、１．２〜１．６ｍｍの範
囲内であり、ほぼ均一であり得る。FIG. 1 is a sectional view showing an alumina crucible according to one embodiment of the present invention. The crucible 10 shown in FIG.
It comprises a bottom portion 12 forming a spherical surface and a body portion 11 formed of an inverted hollow truncated cone connected to the bottom portion 12. The thickness of crucible 10 is in the range of 1.2-1.6 mm and can be substantially uniform.
【０００９】底部１２の上端の外径Ｒ2 は、胴部１１の
開口端の外径Ｒ1 の０．８倍以上１倍未満の大きさであ
る。したがって、胴部１１は、その開口端から底部１２
にかけてテーパーが付いている。本発明のルツボの大き
さの一例を挙げると、胴部１１の開口端の外径Ｒ1 は、
約１９．５ｍｍ〜２０．５ｍｍであり、底部の上端の外
径Ｒ2 は、約１８ｍｍ〜１９ｍｍであり、高さｈは、約
６３．０ｍｍ〜６３．５ｍｍである。The outer diameter R 2 at the upper end of the bottom part 12 is at least 0.8 times and less than one time the outer diameter R 1 at the open end of the body part 11. Therefore, the body 11 is moved from the open end to the bottom 12.
There is a taper over. To give an example of the size of the crucible of the present invention, the outer diameter R 1 of the open end of the body 11 is
About 19.5Mm～20.5Mm, the outer diameter R 2 of the upper end of the bottom is about 18Mm～19mm, the height h is about 63.0Mm～63.5Mm.
【００１０】本発明のルツボは、以上の構成を有するこ
とにより、耐衝撃性に優れたものとなり、使用に当り、
例えば１０００℃以上の温度に予め加熱された炉に室温
から直接装入しても、破損せず、例えばガラス溶融操作
を短時間で行えるようになる。 実施例[0010] The crucible of the present invention has excellent impact resistance by having the above-mentioned structure.
For example, even if it is directly charged from a room temperature to a furnace preheated to a temperature of 1000 ° C. or more, the glass melting operation can be performed in a short time without breakage. Example
【００１１】本実施例に用いた石膏型の一例を図２に示
す。同図（ａ）は、上面図であり、同図（ｂ）は、断面
図である。この型形状をルツボ胴部に対応する部分がテ
ーパーのないストレートなものと、ルツボ胴部に対応す
る部分にテーパーを付けたものと、２種類準備した。こ
の２種類の石膏型に、アルミナをスリップキャスト法に
より鋳込んだ後、それぞれ、焼成・焼結後の肉厚が０．
８ｍｍ、１．０ｍｍ、１．２ｍｍ、１．４ｍｍ、１．６
ｍｍとなるように排泥した。これをそのまま放置し、乾
燥した後、石膏型からルツボ成形品を取り出した。FIG. 2 shows an example of a gypsum mold used in the present embodiment. FIG. 1A is a top view, and FIG. 1B is a cross-sectional view. Two types of this shape were prepared: a straight portion having no tapered portion corresponding to the crucible body, and a tapered portion having a portion corresponding to the crucible body. Alumina was cast into these two types of gypsum molds by a slip casting method, and the wall thickness after firing and sintering was 0.1 mm, respectively.
8mm, 1.0mm, 1.2mm, 1.4mm, 1.6
mm. This was left as it was, and after drying, the crucible molded product was taken out from the gypsum mold.
【００１２】乾燥したルツボ成形品を１００℃／時間の
割合で昇温・加熱して焼成した後、１５００℃で２時間
焼結した。こうして胴部がストレートなルツボと、胴部
にテーパーを付けたルツボとをそれぞれ上記厚さで得
た。なお、いずれのルツボも、その球形底部（Ｒは１５
ｍｍ）の上端外径は１８．５ｍｍであり、高さは６３ｍ
ｍであった。また、胴部にテーパーを付けたルツボの上
部開口端の外径は、１９．５ｍｍであった。The dried crucible molded product was heated and heated at a rate of 100 ° C./hour and fired, and then sintered at 1500 ° C. for 2 hours. Thus, a crucible having a straight body and a crucible having a tapered body were obtained with the above thicknesses. Each crucible has a spherical bottom (R is 15
mm) has an outer diameter of 18.5 mm and a height of 63 m
m. Further, the outer diameter of the upper opening end of the crucible having a body tapered was 19.5 mm.
【００１３】得られたルツボをそれぞれ１０００℃、１
１００℃、または１２００℃に保持された電気炉内に室
温から入れ、耐熱衝撃性を調べた。その結果、胴部がス
トレート形状のルツボは、１０００℃以上の温度ですべ
ての肉厚のものに底部にひびが発生した。これに対し、
胴部にテーパーを付けたものは、１０００℃の温度では
上記全ての肉厚のものにひびの発生は見られなかった
（なお、肉厚が１．６ｍｍを越えたものでは、ひびが発
生したことを確認した）が、１１００℃以上の温度で
は、肉厚１．０ｍｍ以下のものにひびが発生した。Each of the obtained crucibles is heated at 1000 ° C., 1
It was placed in an electric furnace maintained at 100 ° C. or 1200 ° C. from room temperature, and the thermal shock resistance was examined. As a result, a crucible having a straight body had cracks at the bottom at all thicknesses at a temperature of 1000 ° C. or more. In contrast,
At the temperature of 1000 ° C., no cracks were observed in all the above-mentioned thicknesses when the body was tapered (in the case where the thickness exceeded 1.6 mm, cracks occurred). However, at a temperature of 1100 ° C. or more, cracks occurred in those having a thickness of 1.0 mm or less.
【００１４】この結果、本発明で規定するように、胴部
に所定のテーパを付け、肉厚を所定の範囲に規定するこ
とにより、耐熱衝撃性に優れたアルミナルツボが得られ
ることが確認された。As a result, it has been confirmed that an alumina crucible excellent in thermal shock resistance can be obtained by forming a predetermined taper on the body portion and defining the wall thickness in a predetermined range as specified in the present invention. Was.
【００１５】[0015]
【発明の効果】以上述べたように、本発明によれば、急
激に高温に供された場合でも破損しないような高い耐熱
衝撃性を有するアルミナルツボが提供される。As described above, according to the present invention, there is provided an alumina crucible having high thermal shock resistance such that the crucible is not damaged even when suddenly exposed to a high temperature.
【図１】本発明の一実施例によるルツボを示す断面図。FIG. 1 is a sectional view showing a crucible according to one embodiment of the present invention.
【図２】実施例で使用した石膏型を示す図。FIG. 2 is a view showing a gypsum mold used in an example.
【図３】比較例のルツボを示す断面図。FIG. 3 is a sectional view showing a crucible of a comparative example.
１１…胴部、１２…底部。 11: trunk, 12: bottom.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F27B 14/10 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) F27B 14/10
Claims (1)
された逆中空截頭円錐体からなる胴部とを有し、該底部
の上端の外径は、該胴部の開口端の外径の０．８倍以上
１倍未満の大きさであり、該胴部は、その開口端から該
底部にかけてテーパ−を有し、厚さが、１．２〜１．６
ｍｍの範囲内にあることを特徴とする耐熱衝撃性に優れ
たアルミナルツボ。1. A bottom portion forming a spherical surface and a body portion formed of an inverted hollow truncated cone connected to the bottom portion, and an outer diameter of an upper end of the bottom portion is outside an open end of the body portion. The body part has a size of 0.8 times or more and less than 1 time, and the body has a taper from its open end to the bottom, and has a thickness of 1.2 to 1.6.
Alumina crucible excellent in thermal shock resistance characterized by being within the range of mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12169591A JP3152677B2 (en) | 1991-05-28 | 1991-05-28 | Crucible with thermal shock resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12169591A JP3152677B2 (en) | 1991-05-28 | 1991-05-28 | Crucible with thermal shock resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04350491A JPH04350491A (en) | 1992-12-04 |
| JP3152677B2 true JP3152677B2 (en) | 2001-04-03 |
Family
ID=14817595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12169591A Expired - Fee Related JP3152677B2 (en) | 1991-05-28 | 1991-05-28 | Crucible with thermal shock resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3152677B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102284054B1 (en) * | 2019-07-25 | 2021-08-02 | 양정규 | Information board with improved installation convenience and mobility |
-
1991
- 1991-05-28 JP JP12169591A patent/JP3152677B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102284054B1 (en) * | 2019-07-25 | 2021-08-02 | 양정규 | Information board with improved installation convenience and mobility |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04350491A (en) | 1992-12-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20010109 |
|
| LAPS | Cancellation because of no payment of annual fees |