SU361157A1 - ALL-UNION - Google Patents

Description

one

This invention relates to the ceramic industry.

A known method for the manufacture of ceramic products by preparing a mixture based on AlaOs and glass powder, molding the preforms followed by calcining them.

The aim of the invention is to increase the mechanical strength of the products.

This is achieved by using glass with a thermal expansion coefficient of less than 1 / ° C.

The method of drying is as follows.

First, glass with a thermal expansion coefficient of less than 4O 1 / ° C, (3.5-10 1 / ° C), for example, is used, its composition (in wt.%): SiOs 58.8, AlaOa 25.5, CaO 7.6 and MgO 8.1.

Then the glass is crushed to a specific surface of 3000-4000 g / s. "2 are introduced in an amount of 4-6 weight. % From the prepared mixture is formed into blanks, which are then calcined at 1550-1600 ° C in a gas atmosphere.

In the process of sintering the material, the vitreous phase is even more enriched with alumina, the solution itself contains an additional 9% A12O3, which leads to a further decrease in the thermal expansion coefficient of the glass (to a value of the order of 3.1 10 1 / ° C).

The resulting products have an average mechanical strength of 5100 kgf / cm.

Present Invention

Method of making ceramic products

by preparing a mixture based on and

glass powder molding blanks

followed by their roasting, different

in order to increase the mechanical

strength, use glass with a coefficient of thermal expansion of less than 4-10

1 / ° C.