Using isostatic pressing technology to overcome the defects of other forming methods such as hollowness, delamination, low density and uneven density. The particle size, shape, and additives of the raw materials all affect isostatic molding. Molding pressure and holding time affect the density, sintering shrinkage and sintering temperature of the green body. Therefore, it is necessary to use appropriate raw materials and scientific molding process to ensure that the green body has good sintering characteristics. Too high sintering temperature and too long holding time will promote the growth of Al2O3 crystals and increase the amount of liquid phase, which will not only reduce the strength, but also reduce the wear resistance of ceramic grinding balls. Of course, the temperature is too low, the sintering density is reduced, and the wear resistance of the ceramic grinding ball is reduced.
If the sintering temperature is not suitable, even if the content of aluminum oxide is high, the wear resistance is not necessarily good, the key depends on the phase composition and microstructure of the ceramic ball. The use of low-temperature fast-burning technology can obtain significant energy-saving benefits, and at the same time, it can inhibit the growth of alumina ceramic balls, which is conducive to improving the strength and toughness of the product, thereby improving the wear resistance of the ceramic balls. The sintering aid greatly affects the low temperature fast burning, generally adopts the formula of SiO2-CaO-MgO ternary system.
