Strength of sintered Zr N-A12O3-Mo (W) composite materials
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A study was made of the effects of sintering temperature, time, and atmosphere and of composition on the strength of the ternary ZrN-Al2O3-Mo (W) composite materials. It was established that, with molybdenum containing composites of high metal content, isothermal holding during liquid-phase sintering leads to an increase in strength. This is a result of a reaction at the nitride-metal phase boundaries, bringing about the formation of a solid solution of Zr and N in the Mo. The absence of such a reaction at the ZrN-W boundaries is responsible for a marked fall in strength in analogous tungsten-containing composites. Sintering in nitrogen has no effect on the phase composition and strength of the molybdenum-containing composites, but is accompanied by the transition of the α-Al2O3 into a new cubic modification and a fall in strength in the tungsten containing composites. In the molybdenum-containing composites a certain proportion of transgranular fracture over eutectic oxide interlayers, which decreases with rise in metal content, was detected after liquid phase sintering.
KeywordsOxide Nitrogen Atmosphere Solid Solution Tungsten
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