Introduction sintering furnace
Time：2015-11-26 10:58 Click：
Most zirconia being milled today is referred to as “green-state” or “pre-sintered” zirconia. It starts out as a slurry of zirconium oxide, yttrium oxide, hafnium oxide, aluminum oxide, and a number of other trace compounds that are pressed at room temperature into a block, cylinder, or disk. In this state, the material is relatively soft and malleable, not yet suitable for milling. It must be placed into a furnace in the processing facility and fired at a precise temperature, eliminating binder compounds while it hardens and turns into the chalk-like state that milling centers and milling laboratories would recognize. Material density in the pre-sintered state is approximately 40% to 50% of the theoretical maximum density.
Most of today’s porcelain furnaces are totally programmable. Many different porcelain, stains, and materials have forced manufacturers to make furnaces programmable and be able to store different programs for easy retrieval.
While zirconia transforms from one structure to another at around 1,100°C to 1,200°C, most sintering furnaces fire at temperatures closer to 1,500°C. Final sintering temperatures can have a profound effect on the zirconia. Typically, the higher the temperature, the denser the zirconia b comes, usually close to 99% of the theoretical maximum density. For more information, please attention http://www.kejiafurnace.com/