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Process of pressureless sintering to produce dense, high thermal conductivity aluminum nitride ceramic body
Process of pressureless sintering to produce dense, high thermal conductivity aluminum nitride ceramic body
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机译:无压烧结生产致密,高导热性氮化铝陶瓷体的工艺
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摘要
The process comprises forming a mixture comprised of aluminum nitride powder and free carbon wherein the aluminum nitride has a predetermined oxygen content higher than about 0.8% by weight and wherein the amount of free carbon reacts with such oxygen content to produce a deoxidized powder or compact having an oxygen content ranging from greater than about 0.35% by weight to about 1.1% by weight and which is at least 20% by weight lower than the predetermined oxygen content, heating the mixture or a compact thereof to react the carbon and oxygen producing the deoxidized aluminum nitride, and sintering a compact of the deoxidized aluminum nitride producing a ceramic body having a density greater than 85% of theoretical and a thermal conductivity greater than 0. 5 W/cm.K at 22° C.
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机译:该方法包括形成由氮化铝粉末和自由碳组成的混合物,其中氮化铝的预定氧含量高于约0.8重量%,并且其中游离碳的量与该氧含量反应以产生脱氧的粉末或压粉。氧含量范围从大于约0.35重量%至约1.1重量%,并且比预定的氧含量低至少20重量%,加热混合物或其压坯以使碳和氧反应以产生脱氧的氮化铝,并烧结脱氧氮化铝的压块,从而制得陶瓷体,其密度大于理论值的85%,并且在22℃下的导热率大于0. 5 W / cm.K。
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