燒結(jié)石墨模具用石墨
燒結(jié)石墨模具用石墨主要應(yīng)用于電子工業(yè)中,利用石墨導(dǎo)電、導(dǎo)熱特性,如其電導(dǎo)性能比鋁大3～35倍,其導(dǎo)熱、導(dǎo)電性能有別于金屬,具有隨溫度升高導(dǎo)熱系數(shù)反而減小,極高溫度下不導(dǎo)熱,超高溫時(shí)有可靠的隔熱。宏觀定義：在高溫下（不高于熔點(diǎn)），陶瓷生坯固體顆粒的相互鍵聯(lián)，晶粒長(zhǎng)大，空隙(氣孔)和晶界漸趨減少，通過物質(zhì)的傳遞，其總體積收縮，密度增加，最后成為具有某種顯微結(jié)構(gòu)的致密多晶燒結(jié)體，這種現(xiàn)象稱為燒結(jié)。
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