Process for preparing composition 'Sailong' from industrial waste dregs by in-situ synthesis

Abstract

A process for in-situ preparing high-performance Sialon composition from powdered coal ash, coal gangue, clay, white corundum, and carbon (or silicon) powder includes such steps as die pressing, drying at 110 deg.C and nitrifying sinter segmentally. Its advantages include high conversion rate, no carbon, high compactness, mechanical performance and refractory nature, excellent resistance to alkaline slag corrosion, and low cost.

Description

technical field [0001] The invention belongs to the low-cost preparation of reaction sintering novel oxynitride materials. Background technique [0002] Sialon material is based on Si 3 N 4 It is a solid solution based on Si, Al, O, and N elements. It is a high-performance engineering ceramic material developed in the past 30 years. Compared with traditional oxide structure materials, the comprehensive performance of this material is very superior, including mechanical properties (high strength, high hardness, high toughness, high wear resistance, etc.), thermal properties (high temperature resistance, thermal shock resistance, etc.), physical properties (low density, low expansion coefficient) and chemical properties (corrosion resistance, erosion resistance, etc.). Because it is the essence of current structural engineering materials and has broad application prospects, it also occupies an important place in the big stage of international materials...

AI Technical Summary

Problems solved by technology

[0008] In summary, there are several key problems in the production of sialon materials by traditional electric heating CRN technology: (1) high production cost (high energy consumption); (2) low production capacity (limited heating area); (3) The product quality is poor (non-uniform temperature field, residual carbon, etc.); (4) The process system is difficult to adjust (heating rod problem, etc.); (5) The product type is limited (limited to powder materials)

However, the reported method is still the traditional electric heating CRN method, the raw materials used are clay and mud sand natural minerals, and the research level is limited to the laboratory stage

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