Preparation of Ti3SiC2 / Al nanocomposite by using mechanical ball-milling method
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摘要: 研究了用微米级Ti3SiC2 陶瓷颗粒与Al 粉复合球磨制备纳米复合材料的工艺过程。结果表明, 在其他实验参数相同的条件下, 不同材质的磨球对陶瓷颗粒的细化作用差异很大。采用氧化锆磨球可以使Ti3SiC2 的颗粒更好地细化且均匀分散在Al 基体中, 而用钢球和玛瑙球则易产生混合粉的团聚。用氧化锆球进行球磨后的复合粉在550 ℃的温度及20 MPa 的压力下成功地制备了组织成分均匀的大块纳米复合材料。与同成分的非纳米材料相比, Ti3SiC2 / Al 纳米复合材料的硬度从HV60 提高到HV80 , 强度则从110 MPa 提高到150 MPa 。Abstract: Ti3SiC2 / Al nanocomposite was prepared by using the powder metallurgy method. The result s indicatethat the conformation of the mixture has a significant difference with the milling ball. The particle size of Ti3SiC2 will be decreased to about 100 nm and the particles dist ribute homogeneously in the aluminum powder prepared withzirconia balls , whereas the conglomeration will be formed using steel balls and agate balls. Bulk homogeneousTi3SiC2 / Al nanocomposite can be synthesized by hot -pressing the mixed powder under a pressure of 20 MPa at550 ℃. Compared with the popular Ti3SiC2 / Al composite , the Ti3SiC2 / Al nanocomposite has a significant improvement in hardness (from HV 60 to HV 80) and st rength (from 110 MPa to 150 MPa) .
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