聚碳硅烷原位自生增强钛基复合材料的组织及性能

Translated title of the contribution: Microstructure and Mechanical Properties of Polycarbosilane In-situ Reinforced Titanium Matrix Composites

Yu Pan, Weibin Li, Xin Lu, Yucheng Yang, Yanjun Liu, Tailong Hui, Xuanhui Qu

Research output: Contribution to journalArticlepeer-review

Abstract

The in-situ reinforced titanium matrix composites were fabricated using low-oxygen hydride-dehydride (HDH) Ti powders and polycarbosilane (PCS) via a powder metallurgy method, including solution-assisted wet mixing and pressureless sintering. The effects of PCS addition on the oxygen inhibition, sintering densification, microstructure and mechanical properties of the composites were investigated. The results show that the solution-assisted wet mixing process makes the Ti powders coated with PCS, which can effectively control the oxygen contamination. The oxygen content of the fabricated Ti-1.0% PCS (mass fraction) composite is 0.21%~0.24%, much lower than 0.36%~0.41% of CP-Ti. During sintering, the pyrolysis products of PCS can react with Ti matrix to in-situ synthesize TiC particles, while Si element is dissolved in matrix. The incorporation of PCS can improve the mechanical properties of the Ti matrix. The Ti-1.0% PCS composite sintered at 1200℃ for 2 h possesses the best mechanical properties, with a relative density of 98.4%, a Rockwell hardness of 37.1 HRC, a yield strength of 544 MPa, an ultimate tensile strength of 650 MPa, and an elongation of 14.5%. Therefore, the composite is obviously superior to CP-Ti in comprehensive performance index.

Translated title of the contributionMicrostructure and Mechanical Properties of Polycarbosilane In-situ Reinforced Titanium Matrix Composites
Original languageChinese (Traditional)
Pages (from-to)1345-1351
Number of pages7
JournalXiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
Volume49
Issue number4
Publication statusPublished - 2020 Apr 1
Externally publishedYes

Keywords

  • Mechanical properties
  • Polycarbosilane (PCS)
  • Powder metallurgy
  • Titanium matrix composite

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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