Method for preparing alpha/beta multi-phase sialon ceramic powder utilizing waste resistant material and slag

Abstract

A preparation method of alpha / beta- Sialon ceramic powder by the use of discarded refractory and slag, includes a) preparing the materials in the percent of weight, which includes the discarded refractory with the content of alumina and monox more than 80% in the percent of 15-40, the cinder with the content of quicklime more than 30% in the percent of 15-25, the Si material with the content of Si more than 97% in the percent of 15-35, the Al material with the content of Al more than 95% in the percent of 5-25, the alpha- / beta- composite Sialon crystal in the percent of 10-20. b) Encasing the fully mixed materials in the reactor, inflating 20-60MPa nitrogen with the purity more than 99.9%, and firing the materials to act. c) When the action finished, globe milling the acting materials to get the ceramic powder with particle size less than 0.045mm and good performance.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and is applicable to a preparation method of α / β-complex sialon ceramic powder. Background technique [0002] Sialon material has good mechanical properties and thermal shock resistance at high temperature, small expansion coefficient, high chemical stability, corrosion resistance, and strong resistance to molten metal and oxidation. It is a refractory material, sealing ring, bearing, valve body ideal material. [0003] α-Sialon is α-Si 3 N 4 solid solution, the general formula is M x Si 12-(m+n) al m+n o n N 16-n , where n pieces of (Si-N) are replaced by (Al-O), and m pieces of (Si-N) are replaced by (Al-N), the resulting imbalance in electricity price is compensated by x metal elements, and x satisfies x =m / υ(υ is the valence state of the metal element). It has been reported that metal elements that can form α-Sialon include Li, Ca, Mg, Y and some rare earth elements. Since the metal...

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Problems solved by technology

[0008] However, existing single Ca-α-sialon materials (CN1349956, CN 1521141) synthesized by slag or natural minerals have the disadvantages of high sintering temperature and poor material toughness. Secondly, the ratio of adding slag or natural minerals is low, such as using blast furnace slag to synthesize For Ca-α-sialon materials, the proportion of slag added is small (usually the amount of slag added is 20-26%, and the rest of the raw materials are metal aluminum and metal silicon), which has limited effect on reducing the production cost of Ca-α-sialon materials

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