微波烧结金属纯铜压坯

Sintering response of copper powder metal compact in microwave field

分别采用常规电阻加热与微波加热对金属铜压坯进行烧结并比较样品烧结密度、表观硬度以及显微组织分布;微波烧结在功率为1kW、频率为2.45GHz微波炉中进行。结果表明:微波烧结样品平均相对密度达97.3%,略高于相同烧结温度下常规烧结样品的平均相对密度;微波烧结可在较短时间内对粉末冶金金属铜样品实现烧结致密化。另外,微波烧结样品表观硬度比常规烧结样品的高。微波烧结样品具有独特孔隙分布规律,样品横截面中心处孔隙率比横截面边缘处的小;并且微波烧结样品孔隙与显微组织较常规烧结样品细小。

Sintering responses, including relative density, apparent hardness and microstructure evolution of copper powder compacts sintered by both conventional furnace sintering and microwave processing were studied. The microwave sintering was conducted in a 1 kW, 2.45 GHz, multi-mode microwave furnace. The results show that the average relative density of copper powder compacts sintered in microwave furnace is 97.3%, slightly higher than that sintered in conventional furnace, at the same sintering temperature; good densification of copper powder compact can be realized by microwave sintering for much less processing time. In addition, the apparent hardness of microwave sintered samples are higher than those of the conventional sintered ones. A distinct porosity distribution is obtained in microwave sintered samples, with fewer pores in the inside of the cross section than that in the edge part. And much more refined pores and finer microstructures are observed in the microwave sintered samples as compared to those sintered in conventional furnace.