31. Then, put the grinding wheels into sintering furnaces to sinter without press. 32. Later methods involved sintering ( pressure and heat ). 33. Sintering , with subsequent reworking, can produce a great range of material properties.34. Plastic materials are formed by sintering for applications that require materials of specific porosity. 35. Since densification of powders requires high temperatures, grain growth naturally occurs during sintering . 36. Sintering is possible at lower temperatures and over shorter durations than for larger particles.37. Their materials were synthesized using vacuum sintering techniques. 38. They appear as brown-gray powders, which are usually processed by sintering . 39. The process begins with a downdraft sintering operation. 40. ZrB 2 parts are usually densification during sintering .
