基于機械混合法無壓燒結制備ZrB<sub>2</sub>/B<sub>4</sub>C陶瓷復合材料

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基于機械混合法無壓燒結制備ZrB₂/B₄C陶瓷復合材料

基金項目:

國家自然科學基金資助項目(No.50372010)

1. Material Science and Engineering School, University of Science and Technique Beijing, Beijing 100083, China;
2. College of Power, Nanjing Normal University, Nanjing 210042, China;
3. Materials and Metallurgy School, Northeastern University, Shenyang 110004, China

摘要: 研究無壓燒結條件下原位合成工藝對ZrB₂/B₄C陶瓷復合材料的燒結致密化、力學性能、顯微組織的影響.結果表明材料的密度隨著燒結溫度的增加和保溫時間的延長先增加后降低,在燒結溫度2060℃,保溫30min時,ZrB₂/B₄C復合材料的相對密度可達93.2%;材料的硬度隨著溫度的升高而增大,在2070℃時達到最大值;材料的斷裂韌性則隨著溫度的升高呈現下降趨勢,從2000℃時的4.04MPa·m^1/2下降到2060℃時的2.36MPa·m^1/2.
- 陶瓷復合材料 /
- B₄C陶瓷 /
- 機械混合法 /
- 無壓燒結
Abstract: This paper investigated the effects of pressureless sintering in suit synthesis process on the density, physical properties and microstructure of ZrB₂/B₄C ceramic composites. The results showed that, as the sintering temperature increasing and the holding time extending, the density increased first and then decreased, and the maximum relative density of the composites synthesized at 2 060℃for 30 min was 93.2%; the hardness rised with increasing temperature and its value reached to the peak at 2 070℃; opposite to the hardness, the fracture toughness decreased from 4.04 MPa·m^1/2 at 2 000℃ to 2.36 MPa·m^1/2 at 2 060℃.
- ceramic composites material /
- B₄C ceramic /
- mechanical mixing /
- pressureless sintering