Preparation method of high-strength, superhard and wear-resistant brown aluminum oxide containing titanium nitride

Abstract

The invention belongs to the field of wear-resistant materials and refractory materials, and relates to a preparation method of high-strength, superhard and wear-resistant brown aluminum oxide containing titanium nitride. According to the preparation method, titanium-containing alumina, anthracite and scrap iron are adopted as raw materials and are smelted at the high temperature of 2200-2300 DEG C in an electric arc furnace, and impurities are removed; the titanium-containing oxide exists in the high-temperature melt in the forms of Ti2O3 and TiO2; then cooling and sorting are carried out to prepare brown aluminum oxide particles with different granularities; finally, brown aluminum oxide particles with different particle sizes are placed in a nitriding furnace, nitriding treatment is carried out under the nitrogen condition, TiO2 and Ti2O3 in brown aluminum oxide are converted into TiN with higher hardness and strength through a carbon thermal reduction nitriding reaction, and the use performance of brown aluminum oxide is further improved; the hardness and wear resistance of the brown fused alumina are improved by means of the properties of high melting point, high strength and high hardness of titanium nitride; and the toughness of the material is further improved.

Description

technical field [0001] The invention belongs to the field of wear-resistant materials and refractory materials, and in particular relates to a preparation method of high-strength, superhard and wear-resistant brown corundum containing titanium nitride. Background technique [0002] Brown corundum has the characteristics of high hardness, good wear resistance, high strength, high temperature resistance, and corrosion resistance. It is mostly used to make various reaction vessels, pipes, mechanical parts, abrasive molds, knives, and bulletproof materials; Sliding nozzles for pouring steel, smelting of rare and precious metals, and lining materials for ironmaking blast furnaces. [0003] At present, the preparation method of brown fused alumina mainly uses high-alumina bauxite, anthracite, and iron filings as raw materials, and is made in an electric arc furnace through high-temperature melting above 2000 ° C and impurity reduction and cooling to remove impurities; its main che...

AI Technical Summary

Problems solved by technology

But the introduced TiO 2 and carbon cannot be completely removed, so that there are certain titanium-containing inclusions and residual carbon in the corundum, causing the corundum to appear brown

[0004] Residual TiO in brown corundum 2 Easy to react with alumina to form aluminum titanate TiO 2 (Al 2 o 3 ), thereby weakening the alumina intergranular glass phase and increasing the brittleness of brown corundum

In addition, alumina, intercrystalline glass phase and TiO 2 (Al 2 o 3 ) The difference in thermal expansion coefficient will also reduce the performance of brown corundum material