Process or preparing microcrystal wear-resisting alumina ceramic

Abstract

The invention belongs to the field of ceramic processes, and in particular relates to a process for preparing a microcrystal wear-resisting alumina ceramic. The process comprises the following steps: ball-milling raw materials into small particles of 1.8 micrometers; detecting the particle size of slurry; drying and milling the slurry, and then grading the particles; performing pressure forming on blanks; and finally sintering the ceramics. The process has the following advantages: in the process of milling, a servo system is used when conveying the materials from a stock tank to a spray drying tower to ensure that the flowing slurry is even and the moisture in the prepared powder is even; and the adoption of mesh screens with different diameters to perform particle gradation is more reasonable and the particle distribution is controlled precisely.

Description

technical field

[0001] The invention belongs to the technical field of ceramics, in particular to a process for preparing microcrystalline wear-resistant alumina ceramics. Background technique

[0002] Alumina ceramics are the most detailed and widely used ceramics in modern ceramics, with a density of 3.98g / cm 3 , the molecular weight of stoichiometric alumina is 101.96, and the most commonly used crystal type is α-Al with corundum structure 2 o 3 It belongs to the R3c space group, and each cell is composed of 10 molecules. The aluminum ions occupy two-thirds of the octahedral gaps by making the oxygen atoms close-packed approximately hexagonally. Al 2 o 3 Ceramics are stable due to their own performance, especially high temperature performance and chemical performance, and the production process of craft products is relatively simple, low cost and widely used. Especially in the powder or fluid delivery system of thermal power, steel, smelting, mining and other indust...