(北京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院 新型功能材料教育部重點(diǎn)實(shí)驗(yàn)室，北京100022)
摘 要: 以WC-Co復(fù)合粉末為燒結(jié)原料，在實(shí)驗(yàn)測(cè)定石墨模具和試樣的物性參數(shù)的基礎(chǔ)上，采用有限元法對(duì)硬質(zhì)合金SPS過程中燒結(jié)系統(tǒng)的溫度分布進(jìn)行研究。結(jié)果表明：試樣燒結(jié)過程中，燒結(jié)系統(tǒng)內(nèi)的溫度分布不均勻，燒結(jié)溫度較低時(shí)，高溫區(qū)域位于硬質(zhì)合金試樣內(nèi)，隨著燒結(jié)溫度的升高，高溫區(qū)域向壓頭轉(zhuǎn)移，熱量由試樣和壓頭向模具傳遞；試樣中心溫度高于模具中心的測(cè)定溫度，它們之間的差值與試樣加熱速率變化趨勢(shì)一致。模具中心溫度的模擬預(yù)測(cè)結(jié)果與實(shí)驗(yàn)測(cè)定結(jié)果基本吻合。
關(guān)鍵字: WC-Co硬質(zhì)合金；放電等離子燒結(jié)(SPS)；溫度分布；有限元法
（College of Materials Science and Engineering, Key Laboratory of New Functional Materials of Educational Ministry of China, Beijing University of Technology, Beijing, 100022, China）
Abstract: By using the WC-Co powders as the sintering material, based on physical parameters of graphite and sintering samples measured by experiments, the temperature distribution during SPS process to synthesize WC-Co cermets is simulated by finite element method. The results show that there is a greatly inhomogeneous temperature distribution in the SPS system. The highest temperature zone lies in the sample at lower sintering temperature, and moves forward to the punch with increasing sintering temperature. The temperature of the center of die is lower than that of the center of sample and the change of its difference is in accordance with the change of heating rate. It is concluded that the heat transfers from the punch to the die. The prediction results show a good agreement with the experimental measurements
Key words: WC-Co cermet; spark plasma sintering (SPS); temperature distribution; finite element method
