Introduction All of our steel, copper, aluminum and silicon(including semiconductor grade silicon) is made by processes that at some point use high temperatures In producing ceramic parts, high temperature"?"is common. This part of the course is therefore devoted to some of those high temperature operations. By high temperatures" is meant temperatures between about 400 and 1500 C. Earlier we learned that many oxides can be reduced to metals by the inexpensive reducing agents carbon and hydrogen at high temperatures. However, as shown on the next slide. many ores exist as sulfidesIntroduction. All of our steel, copper, aluminum and silicon (including semiconductor grade silicon) is made by processes that at some point use high temperatures. In producing ceramic parts, high temperature “sintering” is common. This part of the course is therefore devoted to some of those high temperature operations. [By “high temperatures” is meant temperatures between about 400 and 15000C.] Earlier we learned that many oxides can be reduced to metals by the inexpensive reducing agents carbon and hydrogen at high temperatures. However, as shown on the next slide, many ores exist as sulfides