Ceramic corundum abrasives and abrasive characteristics analysis

In machining technology continues toward high-speed, high efficiency , and high-precision direction of development , the application of titanium alloy, high temperature alloy stainless steel , high- strength steel and ultra-high- strength steel , composite materials, engineering ceramics and other hard materials are also increasing. High-tech needs of both traditional areas makes grinding wheel corundum and silicon carbide grinding wheel is sometimes difficult to meet production needs, must use stone cutting wheel  the new abrasive wheel to meet demand. Corundum , silicon carbide, diamond and CBN grinding wheels compared to four kinds of abrasives , diamond gradually replace silicon carbide , cubic boron nitride gradual replacement of corundum has become an inevitable trend. But for machining hard materials, because of their brittleness , toughness and ductility large , the hardness is high ( high hardness , or in the presence of a base in a large number of hard particles ) , chemical activity , high temperature strength characteristics, so that the when grinding more difficult , there grinding force, grinding , high temperature, abrasive wear fast , low grinding efficiency, work hardening and serious phenomenon that diamond and CBN abrasive own merits and can not meet such grinding needs. Some  zirconia flap disc new abrasive due to its high toughness , self-sharpening , good benefits, it played an important role in grinding difficult materials , including ceramic corundum abrasives ( also known as microcrystalline corundum abrasives ) appeared to become the highlight of the grinding . 2 Features and application of ceramic corundum abrasives
Ceramic corundum abrasives ( also called microcrystalline corundum abrasive ) is a new aluminum oxide abrasive , corundum and corundum which maintains the high hardness and wear resistance properties , but also has high toughness , easy to change corundum broken disadvantage that has the characteristics of toughened alumina ceramic , which can be widely used in the manufacture of coated abrasives and abrasive . Preparation of ceramic corundum abrasives shown in Figure 1 . Compared with fused alumina abrasive except that different materials and different preparation process . This method uses an aqueous alumina raw material by the sol - gel process for the synthesis of submicron grains (0.1μm ~ 0.2μm) of the corundum crystal structure and prepared by sintering a ceramic microcrystalline corundum. Compared with ordinary corundum abrasives , ceramics and corundum abrasives only high hardness and abrasive microcrystalline structure because it has a lot of crystal solution surface . Grinding or dressing , when dressing , ordinary fused alumina abrasive grain surface along transgranular fracture , showing macro broken ; ceramic corundum abrasives rupture along the grain boundaries , showing microscopic broken, continue to produce sharp cutting edge , self- sharpening and peel less . With its production of grinding wheels with anti- clogging , high abrasion resistance , grinding heat , long life, high rate of removal , grinding and grinding quality is better than the big advantages . It retains the advantages of SG , with breakthroughs in the abrasive shape , there is a very thin rod-like crystalline structure , difficult to machine materials suitable for creep feed grinding and machining Inconel , high-temperature alloys. TG abrasive grinding abrasive material removal rate in the corundum 2 times , seven times the life of  portable belt corundum . Process for preparing ceramic corundum abrasives can microcrystalline alumina abrasive and diamond, cubic boron nitride and other expensive high-grade abrasive combined without reducing the performance of the premise, significantly reduce costs , it can also be white corundum, corundum abrasives and other low-level combine to dramatically improve its performance . So microcrystalline corundum abrasives is a very good application prospects abrasive, currently microcrystalline variety of abrasive corundum abrasives prepared in the aerospace , automotive, mechanical, optical , bearings, tools, molds, and other fields have a wide range of applications .