The utilization of alumina based ceramics has increased in our country. Alumina must have some specific characteristics for production of advanced ceramics. Physical and chemical propertes of Seydişehir alumina make it non-ceramic grade raw materials. The aim of this study is to find out process conditions for production injection moulded ceramics from Seydişehir alumina powders. This study essentially consists of characterisation, improvements of properties, injection moulding and sintering. X-ray diffraction analysis, water absorption, apparent porosity, bulk density and three point bending tests were applied to the sintered samples Physical properties of the products were greatly affected by sintering temperature

The synthesis of AlN powders by carbothermal reduction-nitridation of various types of Al 2 O 3 powders was investigated. Calcium fluoride (CaF 2 ) was added as a catalyst to promote the reaction. An Al 2 O 3 / C molar ratio of 0.29 and CaF 2 of 3 wt. % were fixed in advance. The reduction-nitridation was performed at the various temperatures from 1400 to 1500 °C in N 2 gas flow. The laboratory work essentially consists of characterization of the raw materials, shaping by dry pressing, reaction sintering in tube furnace and characterization of the final products by means of X-ray diffraction.

In this study, wollastonite was synthesized from domestic raw and tailing materials (diatomite, quartz, silica ferrochrome and calcined marble tailing). The laboratory work essentially consists of characterization of the raw and tailing materials, shaping by dry pressing, heat treatment and characterization of the final products by means of XRD. Experimental studies consist of three steps; In the first step; the mixtures containing calcined marble tailing (CMT) and quartz, CMT and diatomite and CMT and silica ferrochrome was shaped using dry press. In the second step; one part of the shaped samples were fired directly, but the second part of the samples were fired after an autoclaving operation at the following pressures 1.2 and 1.5 atmosphere for 4-8 h. respectively. Firing temperatures were 1000, 1100 and 1200 °C. In the third step; XRD analysis were applied to the heated samples. At the end of the research; synthesis of wollastonite by solid-state reaction of the mixture calcined marble tailing and silica ferrochrome at low temperature, i.e 1000 °C. The best results were obtained from the mixture containing silica ferrochrome and calcined marble tailing. Wollastonite was also synthesized from the other mixtures containing CMT-diatomite and CMTquartz. But the intensity of wollastonite peaks were lower than that of the mixture containing CMTsilica ferrochrome. The patterns of the samples autoclaved prior heat treatment showed higher peak at 2θ = 30° than that of the non-autoclaved samples. Intensity of wollastonite peaks increased with the increasing temperatures.

This research describes the procedures and results of an investigation on shaping by a low pressure injection moulding machine and reaction sintering of alumina and titania powders within the temperature range of 1250-1350 °C. Experimental studies consist of four steps; In the first step the hot mixtures containing alumina, titania and wax was shaped using a low pressure injection moulding method at the pressure of 6 atm. and 40 sec molding time. In the second step, binder removal was carried out with the shaped samples by heating to 600 °C. In the third step, debinded parts were sintered at 1250, 1300 and 1350 °C for 2, 10, 2 hours respectively. In the fourth step; XRD analysis, water absorption, apparent porosity, bulk density and three point bending strength tests were applied to the sintered samples. The patterns of the samples sintered at 1300 and 1350 °C showed that the compound Al 2 TiO 5 was produced. With the increasing sintering temperature the intensity of the Al 2 TiO 5 peaks decreased. It was found that 1250 °C is not sufficient to form the Al 2 TiO 5 compound. Optimum results were obtained at 1300 °C . Physical properties of the products were greatly affected by the sintering temperature.