SU979300A1 - Batch for making refractory material - Google Patents

Description

(54) CHARGE TO GET REFRACTORY MATEPHA.fU

one

The invention relates to the manufacture of ceramics, in particular, compositions for the synthesis of zirconium from refractory oxides, and can be used in optical glassmaking for the manufacture of critical glass-reinforced glass, protective layers on clay-honeycomb vessels, as well as for the manufacture of glass-welded glass furnaces.

The known charge for the manufacture of dense and durable refractories, for work in contact with aggressive media, including, wt.%:

SiOj31-33

VjOs0,5-1,5

TiOj0,5-1,0

Zr02 Else Ct3.

To improve the sintering process, additives of oxides of titanium, iron, cerium, vanadium, zinc, and magnesium are used. However, these refractories are highly soluble, melted with glasses with an alkali content of more than 4% by weight. Therefore, despite the good ceramic ,, properties, these refractories cannot be used for cooking phosphate and borosilicate glasses with an alkali content of more than 4 wt.%.,

. Closest to the invention according to the technical essence and the achieved result is SHIET to obtain a refractory material, intended for service under the conditions of spill of aggressive steel and glass, including, for example, wt.%:

ZrOj66

SiOi30

MgO3

ZnO1 E23.

This composition, despite its high density, cannot be used for welding glasses with an alkali content of more than 4%.

Uehb of the invention is the improvement of the glass resistance of material i in phosphate and borosilicate glasses with an alkali content up to I wt.%.

The goal is achieved by the fact that the mixture for obtaining a refractory material, including ZrOj, SiO2, MgO and ZnO, additionally contains CMO3 or NaNOa in the following ratio of components, wt.%: .... ZrOj54.6-70.2 SiOi25.5- 39.0 MgO1.8-2.7 ZnO 0.1-2.0 KNOa or NaNOj .0.4-4.7 Ceramic mass is prepared as follows. Silicon dioxide glassy and zirconium dioxide, together with additives, are subjected to wet grinding with corundum balls in a ball mill at a material: balls ratio: yes 1: 3: 1 for two days. The mass is then dried on or in a drying cabinet at a temperature of 100 ° C. A temporary bond, for example a solution of polyvinyl alcohol, is added to the dried mass and pressed at a specific pressing pressure of 30 MPa. Then the mass is burned at a temperature of 1500-1550 C for 25 hours. Specific examples of the compositions are given in g table. one.

4.25-4.30 4.05-4, 4, 4.05-4.1

Up to 1% 0.00,00.0

4-10 4 Petrographic studies of the material thus prepared showed. besides zirconium, the presence in it of 2–6% by volume of zirconium dioxide and 5–10% by volume of a glass phase. The content of coloring impurities in the material is% by weight. The properties of the samples of the proposed compositions in comparison with the availability of samples of known composition are presented in table. 2. The corrosion resistance of the proposed compositions and the known composition was determined by the static method. The samples were lowered into the glass melt and kept for 24 hours. After testing, the sample volume loss was determined. The table shows that the experimental samples have almost zero corrosion. The invention provides technical efficiency, which is as follows: the obtained lcd refractory showed high corrosion resistance to molten phosphate and borosilicate glasses with an alkali content of up to 11 wt.% / Using this material for cooking phosphate glasses makes it possible to exclude expensive platinum glass Table 1

59793006

Claims (2)

The formula of the invention ZrOj54,6-70,2 The mixture to obtain a refractory mat-MDO 1.8-2.7 rial, including ZrOj, SiOj, MgO and ZnO, ZnO0,1-2,0 characterized in that c5KNOj or NaNOs 0.4-4.7 the purpose of increasing the glass resistance of the mother - Sources of information ala to phosphate and borosilicate stacks are taken into account when examining llamas with alkali content up to 11 wt.%, 1. USSR author's certificate N477975, it additionally contains KNOs, or ik / i. From 04 to 35/48, 1975. NaNOa, with the following ratios 2. USSR author's certificate No. 675035, copies, wt.%: Cl. C 04 B 35/48, 1977 (prototype). SiOj25.5-39.0