纳米碳含量对碳/碳化硅陶瓷的机械加工性及与玻璃熔体润湿性的影响

Effect of Carbon Nanoparticle Content on Machinability and Wettability of Carbon/Silicon Carbide Ceramics

采用无压烧结法制备纳米碳颗粒(nano-Cp)改性碳化硅陶瓷(Cp/SiC),研究了不同纳米碳含量对Cp/SiC陶瓷的机械加工性及与玻璃熔体润湿性的影响。通过XRD和SEM对Cp/SiC陶瓷进行物相和显微分析。研究结果表明:随着可加工相纳米碳含量的增加,Cp/SiC陶瓷的机械加工性能得到明显改善。根据陶瓷材料的机械加工指数(M)综合评价,M15=0.921>M25=0.547>M5=0.056>M0=0.021(下标数字代表碳含量),且15wt%Cp/SiC中的碳颗粒预先被氧化,抑制了Cp/SiC陶瓷基体表面形成SiO2,阻止了Cp/SiC陶瓷与玻璃熔体的润湿,使夹具材料与玻璃熔体不发生粘接,适合用作玻璃夹具材料。

Nanoparticle（nano-Cp）/silicon carbide（SiC） ceramics （Cp/SiC） were prepared via pressureless sintering. Effect of nano-Cp content on machinability and wettability of the Cp/SiC ceramics as a glass clamp was investigated. Phase composition and morphology of the ceramics were characterized by X-ray diffraction （XRD） and scanning electron microscope （SEM）, respectively. Results show that the machinability of the ceramics increases with the increase of the nano-Cp content. According to the evaluation of the machinability index（M） for ceramic materials, M15 = 0.921（for 15wt%Cp/SiC composite）〉M25=0.547（for 25wt%Cp/SiC composite）〉Ms=0.056（for 5wt%Cp/SiC composite）：〉M0=0.02 l（for SiC ceramic）. The pretreatment by oxidation of Cp in the ceramics could depress the formation of SiO2 film on the surface of SiC, thus preventing the wettability between the ceramics and glass smelt and hindering the splice of the fixture material with glass smelt.