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powder sintering
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powder sintering
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工学
粉末冶金烧结
释
powder sintering
粉末冶金烧结
金属粉末或粉末压坯在低于主要组分熔点的温度(或液相体积分数小于40%的超固相线温度)与保护气氛下通过热激活作用使原子发生迁移,实现粉末颗粒间冶金联结的过程。
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Flood and Drought Disasters in China
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flood control and emergency projects in ancient China
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flood control history of China
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flood control of Changjiang River
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flood control of Liaohe River
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