( 1. 中南大學 粉末冶金國家重點實驗室，長沙 410083；
2. 長沙礦冶研究院，長沙 410012；
3. 中南大學 冶金科學與工程學院，長沙 410083)
摘 要: 針對超細硬質(zhì)合金混合料制備過程中出現(xiàn)的研磨與分散問題， 開發(fā)了一種混合料制備新工藝。 采用掃描電鏡、 X射線能譜儀以及金相顯微鏡對分別采用傳統(tǒng)工藝與新工藝制備的WC-8％Co硬質(zhì)合金脫蠟壓坯斷面WC與Co的分布、合金燒結體表面粘結相與WC硬質(zhì)相的分布以及合金的組織結構進行了對比研究， 揭示了硬質(zhì)合金混合料制備新工藝具有較高的研磨與分散效率的特點。新工藝的研磨與分散機理是： 通過混合濕磨介質(zhì)的表面活性劑效應， 促進濕磨介質(zhì)在粉末顆粒缺陷處的滲透， 從而促進粉末顆粒的破碎與團聚體的分散； 通過表面活性劑穩(wěn)定與高分子穩(wěn)定的作用，阻止?jié)衲ミ^程中粉末的團聚。
關鍵字: 超細硬質(zhì)合金； 研磨與分散； 表面活性劑效應； 高分子穩(wěn)定效應； 球磨工藝
（ 1. State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China;
2. Changsha Mining and Metallurgy Research Institute,
Changsha 410012, China;
3. School of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: Focused on the grinding and dispersion issues in the preparation of ultrafine-cemented carbide slurry, a new technique for the preparation of cemented carbide slurry was developed. The distribution of WC and cobalt / binder on the cross section of the de-waxed green compacts and the sinter skins, and the microstructures of WC-8%Co cemented carbide prepared by conventional and new techniques, respectively, were studied by SEM, EDXS and optical microscope to identify the character of the new technique. It is shown that the new technique can be characterized by high efficiency of grinding and dispersion, which is due to the surfactant effect of the multicomponent ball-milling medium and the particle-stabilization effects of the surfactant and macromolecule. The former facilitates the penetration of the milling medium through the defects of particles and thus facilitates the fragmentation of particles and aggregations; the latter can prevent the agglomeration of the cracked particles.
Key words: ultrafine cemented carbide; grinding and dispersion; surfactant effect; macromolecule stabilization effect; ball-milling technique
