(1. 中南大學 粉末冶金國家重點實驗室，長沙 410083；
2. 昆明理工大學 材料科學與工程學院，昆明 650093)
摘 要: 分別采用微波燒結和常規(guī)燒結制備WC-8Co硬質合金，通過1 000~1 400 ℃溫度范圍燒結以及1 400 ℃保溫0~240 min的微波和常規(guī)燒結實驗，測量各樣品的收縮率、密度和晶粒尺寸，分析其致密化行為和晶粒生長，研究燒結溫度和保溫時間對合金致密化和晶粒生長的影響。結果表明，與常規(guī)燒結比較，微波燒結促進YG8硬質合金的致密化，且獲得的合金組織均勻，晶粒細小。另外，保溫時間對微波燒結YG8硬質合金的晶粒生長幾乎沒有影響。
關鍵字: 微波燒結；YG8硬質合金；致密化；晶粒生長
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. School of Materials Science and Engineering, Kunming University of Science and Technology,
Kunming 650093, China）
Abstract:Microwave and conventional technology were used to sintering WC-8Co cemented carbide. In order to research the effects of temperature and holding time on the densification and grain growth of the alloys, experiments with the temperature in range of 1 000−1 400 ℃, and the holding time in range of 0−240 min at 1 400 ℃ were conducted. The shrinkage, density and grain size of samples were systematically measured to analysis the densification behavior and the grain growth. The result shows that, in contrast to conventional sintering, microwave sintering enhances the densification behavior of WC-8Co alloys, and promotes homogeneous microstructure and finer grains. In addition, no evident influence of holding time on the grain growth of alloys sintered by microwave processing is observed.
Key words: microwave sintering; YG8 cemented carbide; densification; grain growth
