The use of microwave energy to heat ceramics at high temperatures has gained increasing interest because of its industrial applications. The technique saves both energy and time, and it improves the materials' properties. In this thesis, we have designed and tested more than 20 heaters which were made of SiC-based composite materials that show a strong and fast microwave absorption in a kitchen microwave oven (2.45GHz, 1.5 KW). The tests were very promising as some heaters could be heated up to temperatures close to T= 1750