(北京科技大學 材料科學與工程學院，北京100083)
摘 要: 采用粒度配比和熱壓固相燒結(jié)方法制備高致密W-Cu梯度熱沉材料，考察燒結(jié)溫度、壓力和保溫時間對梯度材料密度和硬度的影響，并對材料的顯微組織進行觀察。結(jié)果表明：采用熱壓固相燒結(jié)和粒度配比法可以制備近全致密的W-Cu梯度熱沉材料，各梯度層分界清晰，各層組織致密，成分保持為最初的梯度設計；在燒結(jié)溫度1 060 ℃、壓力85 MPa、保溫時間3 h的工藝條件下，所制備的W-Cu三層梯度熱沉材料的封接層、中間層、散熱層的相對密度分別達到98.6%、99.1%和99.5%，硬度HRB分別為91.6、95.6和74.4。
關(guān)鍵字: 鎢銅合金；梯度功能材料；熱壓；粒度配比；相對密度
materials with nearly full density by hot press
（School of Materials Science and Engineering, University of Science and Technology Beijing,
Beijing 100083, China）
Abstract: High density W-Cu functionally gradient material was fabricated by particle size distribution method and hot press. The effects of sintering temperature, pressure, holding time on the density, hardness and microstructure of the gradient materials were investigated. The results show that W-Cu functionally gradient materials with full density can be fabricated by this method. The interface between each layer is clear, each layer achieves high density, and the component of initial gradient design can keep stable. Three-layer W-Cu functionally gradient materials with nearly full density are fabricated under the processing conditions of sintering temperature 1 060 ℃, pressure 85 MPa and holding time 3 h. The relative densities of sealing layer, transitional layer and radiating layer are 98.6%, 99.1% and 99.5% respectively, and the hardness are 91.6, 95.6 and 74.4 HRB respectively.
Key words: tungsten/copper alloy; functionally gradient materials; hot press; particle size distribution; relative density
