Zirconium corundum is made of high-purity alumina and zirconium material as raw materials. After high temperature smelting at 2250?, it is formed by special processing technology and Barmac ball milling. It has high quality, extremely hard, compact structure and special crystals, dendritic eutectic structure. According to the content of ZrO2, zirconium corundum can be divided into ZA25 zirconium corundum (ZrO225%) and ZA40 zirconium corundum (ZrO2 40%).
The biggest feature of zirconium corundum that is different from ordinary corundum and silicon carbide is superior self-sharpening, toughness and wear resistance. Used for making grinding wheels, it can significantly improve the life and sharpness of grinding wheels, and for grinding and cutting workpieces with higher hardness, the wear resistance is particularly obvious. Mainly used in the production of heavy-duty grinding wheels, resin grinding wheels, cutting discs, wear-resistant products, high-end abrasive tools, etc., suitable for steel parts, cast iron parts, heat-resistant steel, titanium alloys, nickel alloys, aluminum alloys, tungsten titanium alloys and other materials The grinding force is higher than that of ordinary corundum products.
Chemical composition
Item ZA25 ZA40
AL2O3 70-72% 55-57%
ZrO2 24-30% 35-44%
TiO2 Max 1.0% Max 0.8%
Fe2O3 Max 0.3% Max 0.25%
SiO2 Max 0.8% Max 0.6%
Typical physical properties
Item ZA25 ZA40
Specific Gravity 4.30g/cm3 4.60g/cm3
Bulk density(LPD) 1.90-2.30g/cm3 2.15-2.45g/cm3
Knoop hardness 1600 1450
Melting Point 1950? 1900?
Particle shape Monoclinical tetragonal
Chemical property Amphoteric
Reaction with acid and alkali NO
Reaction with carbon Forming carbide since 1650 ?
Crystal Size ?30 ?m
Maximum service temperature 1600 ?
Color Gray
Specific heat capacity(cal/g.C) 0.2205(50-500?)
Heat conductivity 0.2718 cal/cm2.sec.?
Linear expansivity(X10-6) 6.82(100-700?)
