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Diamond/SiC陶瓷基复合材料的制备及性能研究

2020-11-30阅读(150)

Diamond/SiC陶瓷基复合材料的制备及性能研究

论文摘要

Diamond/SiC复合材料是一种新型热管理材料,代表着当今先进热管理材料的发展方向。Diamond/SiC复合材料既充分利用了金刚石颗粒较高的热导率,又充分利用了SiC基体良好的综合性能。本文在系统研究Diamond/SiC复合材料工艺设计与反应机理的基础上,国内首次利用真空气相烧结工艺制备出Diamond/SiC复合材料,优化了素坯的模压工艺和原始配方,并对Diamond/SiC复合材料的结构和性能进行了研究。对Diamond/SiC复合材料的烧结工艺进行了优化设计,研究了反应烧结方式、反应烧结温度及保温时间等工艺参数对Diamond/SiC复合材料的影响,确定采用真空气相渗硅烧结工艺,反应温度为1500℃,保温时间1h。研究了烧结过程中金刚石颗粒的石墨化问题,并对硅碳反应机理进行了初步探索,结果表明:反应烧结后,金刚石颗粒保存完整,不存在严重的石墨化。对素坯模压工艺进行了优化研究。选择使用150℃热模压工艺压制素坯。建立了素坯理论孔隙率的计算公式,研究了模压压力对素坯孔隙率和素坯密度的影响,探明了素坯孔隙率对Diamond/SiC复合材料的密度及力学性能的影响。研究表明,模压压力10MPa时,素坯的孔隙率和密度接近理论孔隙率和理论密度,烧结后Diamond/SiC复合材料的密度和力学性能相对较优:金刚石含量40wt%时素坯孔隙率为32%,接近于素坯理论孔隙率33%,制得的Diamond/SiC复合材料密度为3.11 g/cm3,抗弯强度和弹性模量分别为160MPa、175GPa;金刚石含量80wt%时素坯孔隙率为23%,接近于素坯理论孔隙率22%,制得的Diamond/SiC复合材料密度为3.18g/cm3,抗弯强度和弹性模量分别为110MPa、140GPa。对原始配方进行了优化研究。探明了金刚石的品级、粒度、含量等因素对Diamond/SiC复合材料的力学性能、导热性能的影响。研究显示:品级较优的金刚石颗粒制得的Diamond/SiC复合材料具有更好的力学性能和导热性能;Diamond/SiC复合材料的热导率随着金刚石粒径的减小呈递减趋势;随着原始配方中金刚石含量的增多,Diamond/SiC复合材料的力学性能不断下降,而热导率则逐渐增大。选用优品级50目金刚石,金刚石含量为80wt%时,制得Diamond/SiC复合材料的热导率达到280 W/（m·K）。另外,探索了酚醛树脂、硅粉、石墨粉等辅助配料在反应烧结过程中的作用。酚醛树脂的加入量应控制在5-15wt%以内,硅的加入量应控制在30wt%以内,石墨粉的加入量应控制在10wt%以内。对Diamond/SiC复合材料的组成和显微结构进行了分析。Diamond/SiC复合材料由金刚石、SiC、Si三相组成,金刚石颗粒与SiC基体结合紧密,界面紧密牢固,断裂模式为穿晶断裂;金刚石颗粒保存完好,均匀地镶嵌在基体相中。

论文目录

  • 摘要
  • ABSTRACT
  • 第一章 绪论
  • 1.1 Diamond/SiC 复合材料研究背景
  • 1.2 Diamond/SiC 复合材料研究现状
  • 1.3 本文选题依据与研究内容
  • 第二章 实验部分
  • 2.1 原料及试剂
  • 2.2 实验过程
  • 2.3 Diamond/SiC 复合材料的基本性能测试
  • 2.3.1 密度及孔隙率的测定
  • 2.3.2 弯曲强度与弹性模量的测定
  • 2.3.3 热导率测试
  • 2.4 显微组织结构及成分分析
  • 第三章 Diamond/SiC 复合材料的工艺设计及机理研究
  • 3.1 Diamond/SiC 复合材料烧结工艺设计
  • 3.1.1 反应烧结渗硅方式的确定
  • 3.1.2 反应温度的确定
  • 3.1.3 保温时间的确定
  • 3.1.4 升温制度的确定
  • 3.1.5 小结
  • 3.2 真空气相烧结反应机理研究
  • 3.2.1 气相反应的基本过程
  • 3.2.2 硅、碳界面反应机理
  • 3.2.3 小结
  • 第四章 Diamond/SiC 复合材料的制备工艺及性能研究
  • 4.1 素坯模压工艺优化研究
  • 4.1.1 模压温度的选择
  • 4.1.2 素坯理论孔隙率和理论密度的计算
  • 4.1.3 模压压力对素坯孔隙率、密度的影响
  • 4.1.4 素坯孔隙率对Diamond/SiC 复合材料密度的影响
  • 4.1.5 素坯孔隙率对Diamond/SiC 复合材料力学性能的影响
  • 4.1.6 小结
  • 4.2 原始配方的优化研究
  • 4.2.1 金刚石的品级对Diamond/SiC 复合材料性能的影响
  • 4.2.2 金刚石的粒度对Diamond/SiC 复合材料性能的影响
  • 4.2.3 金刚石的含量对Diamond/SiC 复合材料性能的影响
  • 4.2.4 辅助配料对Diamond/SiC 复合材料性能的影响
  • 4.2.5 小结
  • 4.3 Diamond/SiC 复合材料组成和显微结构分析
  • 4.3.1 Diamond/SiC 复合材料的金相分析
  • 4.3.2 Diamond/SiC 复合材料的物相分析
  • 4.3.3 Diamond/SiC 复合材料的形貌分析
  • 4.3.4 小结
  • 第五章 结论
  • 致谢
  • 参考文献
  • 攻读硕士学位期间取得的学术成果

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    Diamond/SiC陶瓷基复合材料的制备及性能研究
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