Scientists and technicians have conducted research from many aspects. Among them, the performance of low-temperature ceramic bond is a key factor that affects the memory quality and development of ceramic bond diamond grinding wheels. Therefore, research on low-temperature ceramic bonding agents with excellent properties such as high strength, low temperature, and low expansion coefficient is the focus of research on superhard material ceramic grinding wheels at home and abroad.
Tanaka T, Esaki S, Nishida K, etc., by selectively increasing the number and size of pores in the grinding wheel, the self-sharpening properties of the superhard material set grinding wheel can be further improved.
Jackson MJ, Barlow N, Mills B control the pore structure in the superhard material ceramic grinding wheel, so that the produced grinding wheel has high bond strength, good grinding efficiency and cooling performance during grinding. Through thermomechanical analysis, Raman spectroscopy and other means, Kuan-Hong Lin, Shih-Feng Peng, Shun-Tiab Lin measured the sintering temperature, sintering atmosphere, and sintering time on the sintering shrinkage rate of superhard ceramic grinding wheels and the burning loss of diamonds. The sintering parameters and grinding characteristics of the vitrified bond diamond grinding wheel are studied. The superhard material ceramic bond formula selected by Russian scholars is mainly based on chemical composition, and boron glass or boron-lead glass system is selected as the theoretical research object. In-depth research has also been conducted on lead-glass bonding agents, but lead is a toxic substance and is easily decomposed at high temperatures.
As early as the 1990s, Japanese researchers studied the selection requirements of the grinding wheel concentration and abrasive grain requirements for high-efficiency and high-precision grinding with vitrified bond diamond grinding wheels. To study the grinding performance of the superhard material grinding wheel of the borosilicate glass system binder with Na2O-B2O3-SiO2 as the basic component; the formula of the ceramic bond is mainly based on the chemical composition, and the boron glass or boro-lead glass system is selected as Theoretical research object.
In foreign studies, researches on toughening and strengthening of ceramic bonds have begun, such as microcrystallization of the glass phase of the bonding agent, and the addition of appropriate amounts of whiskers to the bonding agent. They found that adding silicon borate whiskers to the binder can inhibit the formation of cristobalite and prevent the cristobalite from cracking in the grinding wheel due to its rapid volume expansion at 100°C to 200°C; on the other hand, aluminum borate whiskers It can have the effect of whisker reinforcement by itself, thereby improving the tensile strength of the bonding agent.
Due to factors such as the relatively large coefficient of difficulty when the ceramic bond is combined with diamond abrasives, the development and production of the ceramic bond diamond grinding wheel has been hindered. Engineers took the lead in producing ceramic bond diamond grinding wheels for grinding gemstones in China, and formulated a variety of grinding wheel specifications, which have been favored by the gem processing field. Nowadays, the series of ceramic bond diamond grinding wheels for grinding PCD/PCBN tools, ceramic bond diamond grinding wheels for grinding diamond composite sheets and other series of ceramic bond diamond grinding wheels have gained a good reputation in the market.
How did the ceramic diamond grinding wheel develop?
2020 08/17