Preparation method of carborundum composite-phase ceramic

Abstract

The invention discloses a producing method for carborundum complex phase ceram including a compound powder composed of carborundum and yttrium aluminitum garnet, firstly orderly doing a dry pressing and prepressing and cold isopressing, then sintering the disposed biscuit in vacuum without pressure; the weight percent proportion of the compound powder: 85-95% of carborundum and 5-15% of carborundum and yttrium aluminitum garnet; the preparing process including: 1) respectively adding the aluminum nitrate, yttrium nitrate into deionized water, then slowly adding methenamine solution, blending for 10-20 minutes at 35-80 DEG C to obtain transparent sol carborundum and yttrium aluminitum garnet; 2) adding carborundum fine powder, blending for 15-30 minutes in the water of 50-80 DEG C to obtain compound gel; 3) after the compound gel dry, heat processing for 2-6 hours at 900-920 DEG C to obtain compound powder. The produced carborundum complex phase ceram has a good mechanical property and a good thermal property.

Description

technical field [0001] The invention relates to a preparation method of silicon carbide composite phase ceramics. Background technique [0002] As a high-temperature structural ceramic, silicon carbide ceramics have many excellent properties, such as wear resistance, high thermal conductivity and electrical insulation, semiconductor and electrical conductivity, heat resistance, corrosion resistance, and high-temperature mechanical and thermal properties. Silicon carbide ceramics have been widely used in machinery, electronics, petrochemical, metallurgy and other industrial fields, as well as the national defense industry, and have been recognized internationally as the fourth basic mechanical sealing material since metal, alumina, and cemented carbide. [0003] However, high-purity silicon carbide is difficult to densify and sinter, and it is usually necessary to add sintering aids. Commonly used sintering aids are B-C, Al-B-C, Al 2 o 3 , AlN-Y 2 o 3 , Al 2 o 3 -Re 2...

AI Technical Summary

Problems solved by technology

The above method generally adopts the mechanical blending method to directly introduce the mixture of alumina and yttrium oxide, and utilizes alumina and yttrium oxide to generate yttrium aluminum garnet at high temperature to prepare silicon carbide composite ceramics; the above method has the following disadvantages: uneven mixing, It leads to uneven distribution of sintering aids in the silicon carbide matrix; and the sintering temperature needs to be controlled above 1950°C, which will cause the reaction between alumina and silicon carbide to volatilize, resulting in the loss of active ingredients

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