(中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 采用粉末冶金方法在無壓氫氣氣氛下燒結(jié)制備W-ZrB2合金，對其燒結(jié)致密化行為、顯微組織及ZrB2的物相變化進行研究。結(jié)果表明：W-ZrB2合金具有較高的燒結(jié)活性，在1680 ℃燒結(jié)后相對密度達到97.5%；添加的ZrB2粒子在燒結(jié)過程中容易吸附氧形成含Zr、B、O等元素的復(fù)合物粒子，主要以球狀二次相粒子形式分布于燒結(jié)合金的晶內(nèi)和晶界處，有效的抑制燒結(jié)過程中晶粒的長大，合金燒結(jié)后晶粒尺寸僅為10 μm左右。
關(guān)鍵字: W-ZrB2合金；燒結(jié)行為；顯微組織；物相變化
（State Key Laboratory of Power Metallurgy, Central South University, Changsha 410083, China）
Abstract:W-ZrB2 alloy was fabricated by powder metallurgy method with pressure-less sintering under hydrogen atmosphere, the sintering densification behavior, microstructure and phase transition of ZrB2 were studied. The results show that the W-ZrB2 alloy has high sintering activity, and the relative density of W-ZrB2 alloy reaches to 97.5% after being sintered at 1680 ℃. The additions of ZrB2 particles are easy to be oxidized to form complex particles which contain elements, such as, Zr, B, O, during sintering. These particles disperse uniformly on the transgranular and grain boundaries of the sintered alloy in the form of spherical second phase which can inhabit the grain growth effectively, and the average grain size of W-ZrB2 alloy is only 10 μm.
Key words: W-ZrB2 alloy; sintering behavior; microstructure; phase transition
