燒結(jié)過程中Co粉和Ni粉擴散溶解的研究

編號：FTJS00414

篇名：燒結(jié)過程中Co粉和Ni粉擴散溶解的研究

作者：宋玉強; 李世春;

關(guān)鍵詞：Co粉; Ni粉; 燒結(jié); 固溶體; 原子相圖; 溶解; 擴散;

機構(gòu)： 中國石油大學(xué)機電學(xué)院; 中國石油大學(xué)機電學(xué)院 山東東營; 山東東營;

摘要： 利用光學(xué)顯微鏡、掃描電鏡、X射線衍射和能譜技術(shù)研究了Co粉和Ni粉固相燒結(jié)時形成的燒結(jié)體的微觀形貌和相結(jié)構(gòu);并利用原子相圖討論了Co-Ni固溶體的形成機理、計算了該固溶體的電子密度。結(jié)果表明,不同混合比例的Co粉和Ni粉壓坯在1000℃×36 h的燒結(jié)過程中,Co原子以間隙擴散機制進入Ni粉末顆粒,而Ni原子幾乎不能進入Co粉末顆粒,最終全部形成Co-Ni無限間隙固溶體,同時使固溶體晶界處產(chǎn)生大量孔隙,該固溶體的電子密度為3.2709×1029個/m3。 The microstructure of sinter of Co powder and Ni powder formed during sintering was studied by OM,SEM,EDS and X-ray diffraction.The formation mechanism of Co-Ni solid solution was discussed and electron density of Co-Ni solid solution was calculated by means of Thomas-Fermi-Dirac-Cheng phase diagram(TFDC).The results show that the various mixtures of Co and Ni entirely come into being Co-Ni infinite interstitial solid solution,a great deal of holes produce at grain boundary of solid solution because only Co...