Low-silicon micro-sodium white sapphire micro powder used for electronic insulating ceramic and preparation method of low-silicon micro-sodium white sapphire micro powder

Abstract

The invention provides low-silicon micro-sodium white sapphire micro powder used for electronic insulating ceramic and a preparation method of the low-silicon micro-sodium white sapphire micro powder. The problems that products are poor in mechanical performance, fire resistance, insulativity and the like are solved by decreasing the content of Na2O and Si in the products. The low-silicon micro-sodium white sapphire micro powder is prepared by adding compound mineralizer with industrial aluminum oxide as the raw material, and conducting ball milling, high-temperature melting and crystallizing, breaking, grinding and acid pickling, wherein the compound mineralizer comprises boric acid, ammonium chloride and aluminum fluoride, and crystals are in the irregular particle shape. By means of the prepared low-silicon micro-sodium white sapphire micro powder, the Na2O content of the low-silicon micro-sodium white sapphire micro powder can be decreased to 0.1% (w/w) or below, the content of Si is decreased to 0.02% (w/w) or below, the content of Na2O and silicon is remarkably lower than the content of sodium and silicon in the traditional white sapphire products, and the fire resistance degree and mechanical performance of white sapphire are improved; meanwhile, the insulating performance is enhanced, and therefore the low-silicon micro-sodium white sapphire micro powder can be used for the fields of high-end abrasive materials, electronic insulating ceramic and high-grade fireproof materials, and the industrial application range is widened.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a low-silicon micro-sodium white corundum micropowder for electronic insulating ceramics and a preparation method thereof. Background technique [0002] White corundum products are widely used in the fields of high-end abrasives, insulating ceramics and refractory materials. Among traditional white corundum products, Na 2 The weight content of O is generally 0.3%-0.6%; Na 2 O will react with alumina to form β-alumina, and its metering formula is Na 2 O·11Al 2 o 3 , The refractoriness and mechanical properties of β-alumina are worse than those of corundum, so white corundum with high sodium content has poor overall performance and low insulation performance; silicon content is generally 0.06-0.15%, silicon is a semiconductor, its Existence will also reduce the insulation of white corundum products, thus limiting its application in the fields of high-end abrasives, in...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the technical defects of the prior art, and provides a low-silicon micro-sodium white corundum powder for electronic insulating ceram