概述了国外碳化硅连续纤维增强钛基复合材料的研制、性能及应用情况 ,并对箔压法制备 Si Cf/Ti复合材料的工艺及材料性能进行了研究。结果表明 ,本研究采用 FFF法制作的 Si Cf/Ti复合板材性能达到国外同类材料水平。此外 ,本研究还对 Si...概述了国外碳化硅连续纤维增强钛基复合材料的研制、性能及应用情况 ,并对箔压法制备 Si Cf/Ti复合材料的工艺及材料性能进行了研究。结果表明 ,本研究采用 FFF法制作的 Si Cf/Ti复合板材性能达到国外同类材料水平。此外 ,本研究还对 Si Cf/Ti复合材料各主要制作工艺进行了分析比较 ,认为真空等离子喷涂工艺是较有前途的。展开更多
The effect of the pyrolytic carbon(PyC)interface thickness on the heat-stability of CansasⅡSiC_(f)/SiC composites under Ar up to 1500℃was studied in detail.After the heat treatment at 1500℃for 50 h,the interface bo...The effect of the pyrolytic carbon(PyC)interface thickness on the heat-stability of CansasⅡSiC_(f)/SiC composites under Ar up to 1500℃was studied in detail.After the heat treatment at 1500℃for 50 h,the interface bonding strength of the thin interface(about 200 nm)decreases from 74.4 to 20.1 MPa(73.0%),while that of the thick interface(about 2μm)declines from 7.3 to 3.2 MPa(52.7%).At the same time,the decline fraction of strength of the composites with the thin interface is 12.1%,less than that with the thick interface(42.0%).The fiber strength also decreases after heat treatment,which may be due to the significant growth ofβ-SiC grains and critical defects.The different heat-stability of the interface with the thin and thick thickness might be related to the inconsistency of the degree of the graphitization of PyC.Compared with the composites with the thick interface,the composites with the thin interface remained higher tensile strength after heat treatment due to the better interface bonding strength.The interface with strong bonding strength could protect the fiber by postponing the decomposition of amorphous phases SiC_(x)O_(y) and hindering the generation of fiber defects.展开更多
基金Project(6142907200301) supported by the National Defense Pre-Research Foundation of ChinaProject supported by the Key Laboratory for Lightweight High Strength Structural Materials,Central South University,China。
文摘概述了国外碳化硅连续纤维增强钛基复合材料的研制、性能及应用情况 ,并对箔压法制备 Si Cf/Ti复合材料的工艺及材料性能进行了研究。结果表明 ,本研究采用 FFF法制作的 Si Cf/Ti复合板材性能达到国外同类材料水平。此外 ,本研究还对 Si Cf/Ti复合材料各主要制作工艺进行了分析比较 ,认为真空等离子喷涂工艺是较有前途的。
基金Funded by the National Science and Technology Major Project(No.2017-IV-0005-0042)the China Postdoctoral Science Foundation(No.2021M691566)。
文摘The effect of the pyrolytic carbon(PyC)interface thickness on the heat-stability of CansasⅡSiC_(f)/SiC composites under Ar up to 1500℃was studied in detail.After the heat treatment at 1500℃for 50 h,the interface bonding strength of the thin interface(about 200 nm)decreases from 74.4 to 20.1 MPa(73.0%),while that of the thick interface(about 2μm)declines from 7.3 to 3.2 MPa(52.7%).At the same time,the decline fraction of strength of the composites with the thin interface is 12.1%,less than that with the thick interface(42.0%).The fiber strength also decreases after heat treatment,which may be due to the significant growth ofβ-SiC grains and critical defects.The different heat-stability of the interface with the thin and thick thickness might be related to the inconsistency of the degree of the graphitization of PyC.Compared with the composites with the thick interface,the composites with the thin interface remained higher tensile strength after heat treatment due to the better interface bonding strength.The interface with strong bonding strength could protect the fiber by postponing the decomposition of amorphous phases SiC_(x)O_(y) and hindering the generation of fiber defects.
