Method for improving aluminium oxide ceramic abrasive resistance by precipitation reaction

Abstract

The invention relates to a method for preparing aluminium oxide ceramics with good wear-resisting property, that is, low-cost soluble salt is added in slurry which takes water and aluminum oxide as main raw material, and then dehydration pelleting, molding and sintering are carried out; the specific method is that: one working procedure is added after ball-milling procedure and before pelleting procedure in the original preparation process; proper salt which can be dissolved in water and generates metal ions is added in the slurry with qualified fineness and viscosity by ball-milling; the added metal salt can be one, part or all of magnesium salt, calcium salt, yttrium salt, aluminum salt, strontium salt, barium salt, zircon salt, cerium alt and lanthanum salt, the total adding amount accounts for 0.1-30 percent of the alumina powder material, and the optimized adding amount is from 2 percent to 20 percent; the added precipitators can be one, partial or all of sodium hydroxide, sodium carbonate, sodium bicarbonate, sodium fluoride, sodium sulfide, sodium silicate, sodium aluminate, potassium hydroxide, potassium carbonate, potassium silicate, lithium hydroxide, lithium carbonate, calcium hydroxide, calcium oxide, barium hydroxide, ammonia, ammonium carbonate, ammonium hydrogencarbonate, ammonium fluoride, ammonium sulfide and carbamide, the total adding amount accounts for 0.05-20 percent of the alumina powder material quantity, and the optimized adding amount is 1-10 percent.

Description

technical field

[0001] The invention relates to a preparation method for improving the toughness of porcelain parts by reacting in slurry to generate precipitates. More specifically, this patent relates to a method of adding low-cost soluble salts into a slurry mainly composed of water and alumina, followed by dehydration, granulation, molding, and firing to obtain alumina with excellent wear resistance. ceramic method. It belongs to the field of fine ceramics in inorganic non-metallic materials. Background technique

[0002] Alumina ceramics are based on α-Al 2 o 3 Oxide ceramics, which are mainly composed of minerals, have the characteristics of large elastic modulus, extremely difficult to deform, good thermal stability, strong high temperature oxidation resistance, and low price, so they are favored by people. Alumina ceramics are currently one of the fine ceramic materials with the largest production volume and the widest application range in the world. They are wid...