復(fù)合材料的影響
(華南理工大學(xué) 國家金屬材料近凈成形工程技術(shù)研究中心，廣州 510640)
摘 要: 以鈦粉、硅粉和石墨粉為原料，制備出(1−x)Ti3SiC2+xSiC(x=0.1~0.8)復(fù)合材料，并利用X射線衍射儀對樣品進行相組成分析。結(jié)果表明：經(jīng)1 300 ℃放電等離子燒結(jié)15 min后，可以得到純凈的0.9Ti3SiC2-0.1SiC和含有微量石墨的0.2Ti3SiC2-0.8SiC復(fù)合材料，0.9Ti3SiC2-0.1SiC和0.2Ti3SiC2-0.8SiC復(fù)合材料的顯微硬度分別為8.8和10.5 GPa，均明顯高于Ti3SiC2的(4 GPa)。隨著SiC含量的增加，復(fù)合材料的硬度也增加，但雜質(zhì)(石墨)和孔洞的含量也增多，成分為0.5Ti3SiC2-0.5SiC的復(fù)合材料在燒結(jié)過程中有少量Si流出；而當(dāng)SiC含量增加到0.2Ti3SiC2-0.8SiC時，燒結(jié)過程中大量的Si流出使得復(fù)合材料無法成功燒結(jié)。
關(guān)鍵字: 復(fù)合材料；Ti3SiC2；SiC；放電等離子燒結(jié)
（National Engineering Research Center of Near-net-shape Forming Technology for Metallic Materials,
South China University of Technology, Guangzhou 510640, China）
Abstract:The elemental powders were used to prepare (1−x)Ti3SiC2+xSiC composite (x=0.1−0.8) by using spark plasma sintering. X-ray diffractometer was employed to analyze the phase constituents. The results show that, after sintering at 1 300 ℃ for 15 min, pure 0.9Ti3SiC2-0.1SiC and 0.2Ti3SiC2-0.8SiC composites with tiny amount of graphite as impurities were obtained. The microhardness of 0.9Ti3SiC2-0.1SiC and 0.2Ti3SiC2-0.8SiC composites is 8.8 and 10.5 GPa, respectively, which is significantly higher than that of Ti3SiC2 (4 GPa). As the SiC contents increase, the impurity (graphite) and pore concentration of the sintered composite increase. During the sintering of 0.5Ti3SiC2-0.5SiC, some Si melts out from the sample. When the SiC content reaches 0.2Ti3SiC2-0.8SiC, the sintering is failed because significant amount of Si melts out from the sample.
Key words: composite; Ti3SiC2; SiC; spark plasma sintering
