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The method for preparing the ceramic material by firing and decomposing the precursor compound under certain conditions is a solid-phase thermal decomposition method(brown aluminum oxide). For example, aluminum ammonium sulfate (A12 (NH4) 2 (SO4) 4 · 24H2O) or aluminum ammonium carbonate (NH4AIO (OH) HCO3) is calcined and thermally decomposed to obtain y-Al2O3, and then shaped and calcined to obtain ceramic corundum abrasive(silicon carbide grit suppliers).

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The synthesis and decomposition reaction process using Al2 (NH4) n (SO4) 4-24H2O as raw materials is as follows(pink aluminum oxide): Al2 (SO4) · 24H2O + (NH4hSO4 → Al2 (NH4) 2 (SO4) 4 · 24H2O, Al2 (NH4) 2 (SO4 ) 4 · 24H2020CC → Al2 (SO4) 3 · (NH42SO4 · H20 + 23H2Of, Al2 (SO4) 3 · (NH4) SO2 · H2O → Al2 (SO4) 3 + 2NH + SO3f + 2H2O, Ah (SO4) s0-rC → y-A2O3 + 3SOst, y-A12O3-13Cy, a-Al2O3 + H2O. There are two main types of self-propagating reaction(low density white alumina): direct synthesis and Mg thermal and Al thermal synthesis.(brown aluminum oxide grit wholesale suppliers mexico)

Ouyang Shixi et al. Used Ah (SO2) 3 · 18H2O as raw material, and added sintering aids to synthesize micro-powder corundum abrasive at 1400 ℃(brown aluminium oxide). The grain size was 10-20um and the hardness reached more than 2400kg / mm. The synthesis and decomposition reaction process using ammonium aluminum carbonate as raw material is as follows(brown fused alumina suppliers): Al2 (NH4) 2 (SO4) 4+ 4NH4HCO3 → NH4AIO (OH) HCO3 + 2NH42SO4, NH4AIO (OH) HCO30-0C → Amorphous-Al2O3-00- 0C → y-Al2O3, 10s0-1300C> a-Al2O3.

(brown aluminum oxide grit wholesale suppliers mexico)Taimei Kagaku Kogyo Co., Ltd. mother used aluminum ammonium carbonate thermal decomposition method to synthesize the precursor, added 0.1 ~ 0.5% SiO2(white aluminium oxide), calcined at 1370 ℃ to obtain a density of 3.90g / cm3, average grain size 0.5um Crystal corundum abrasive. The CX series abrasives of Noritake Corporation of Japan are also made by sintering using the thermal decomposition of ammonium aluminum carbonate as raw material(brown fused aluminum oxide suppliers).

The substances involved in the reaction are generally carried out in a solid-solid(black aluminum oxide), solid-gas mediumSelf-propagation high-temperature systhesis (SHS for short) is a technology that uses the self-heating and self-conduction of high chemical reaction heat between reactants to synthesize materials. SHS technology is based on the basic principle of exothermic chemical reaction(wholesale brown fused alumina), using external energy to induce local chemical reaction (ignition) to form a chemical reaction front (combustion wave).(brown aluminum oxide grit wholesale suppliers mexico)

After that, the chemical reaction continues with the support of its own exotherm(brown fused alumina), which is manifested as the combustion wave spreads to the entire system, and finally the required materials are synthesized, but the final product is generally solid. This is a highly exothermic reaction(brown aluminum oxide 250 grit). Its main feature is that the reaction only needs local ignition to initiate the combustion wave and make it propagate in the raw material to realize the systematic synthesis process.