High-temperature-resistant paint film for diamond vacuum reduction and sintering basket

Abstract

The invention relates to a high-temperature-resistant paint film for a diamond vacuum reduction and sintering basket. The paint film is prepared from, by weight, 12-15 parts of aluminum oxide fine powder, 5-10 parts of dititanium nitride fine powder, 8-10 parts of calcium hexaboride fine powder, 10-15 parts of chromium trioxide fine powder, 2-4 parts of graphite, 15-20 parts of asphalt and 30-40 parts of gasoline. The high-temperature-resistant paint film prepared through the method and the sintering basket coated with the high-temperature-resistant paint film and subjected to high temperature treatment are resistant to high temperature not lower than 1200 DEG C, are durable and can meet normal use conditions of artificial diamond, and adhesion between metal sintering baskets in the high-temperature state can be effectively prevented. Besides, no influence is caused on characteristics and quality of diamond products, the use effect is very good in hoisting and forking in automatic production, and smooth automatic production can be well ensured.

Description

technical field [0001] The invention belongs to the technical field of supporting auxiliary materials for vacuum heat treatment tooling of superhard materials, and in particular relates to a high-temperature-resistant paint film for a diamond vacuum reduction sintering basket. Background technique [0002] Sintering in a vacuum reduction furnace is an important step in the process of synthetic diamond. Metal sintering baskets and non-metallic materials are used to form sintered workpieces, which are placed in a vacuum reduction furnace for sintering. The sintering basket is composed of a metal skeleton and a metal shell covering the outside. During use, because the upper and lower sintering baskets are often stacked together, the metal shell of the sintering basket becomes soft at high temperature, making the The upper and lower stacked sintering baskets are prone to sticking, and it is difficult to separate them during subsequent production operations, which affects normal ...

AI Technical Summary

Problems solved by technology

The sintering basket is composed of a metal skeleton and a metal outer covering. During use, because the upper and lower sintering baskets are often stacked together, the metal outer shell of the sintering basket becomes soft at high temperature, making the The upper and lower stacked sintering baskets are prone to sticking, and it is difficult to separate them during subsequent production operations, which affects normal use and is not conducive to automated production. In addition, sintering baskets are indispensable tooling for automatic lines. If sticking occurs, the entire The automatic line may stop production for about half an hour, which greatly affects normal production

However, if it is forcibly removed, it may cause damage to the sintered workpiece, and the safety factor is low, resulting in low production efficiency

However, using existing high-temperature-resistant paints or paints on the market to carry out anti-adhesion coating on the surface of metal sintering baskets, some of them have a temperature that cannot meet the conditions of use, and some of them can achieve certain anti-adhesion although their temperature resistance can meet the conditions of use. effect, but the ingredients in the paint contain organic silicon or inorganic silicon substances that have a great influence on diamonds, and silicon and carbon will form silicon carbide under high temperature conditions, which will destroy the structure and physical properties of diamonds