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Ultrahigh-temperature ceramic-based composite material and preparation method thereof
The invention relates to the technical field of ultrahigh-temperature ceramics, and discloses an ultrahigh-temperature ceramic-based composite material and a preparation method thereof, and the method comprises the following steps: S1, raw material powder ball-milling mixing and rare earth metal element introduction, S2, powder hydrogen reduction, and S3, powder sintering. The rare earth metal powder is added into the ultrahigh-temperature ceramic raw material powder for ball milling and mixing, and the mixed powder is subjected to hydrogen reduction, so that the oxygen content of the composite ceramic is lower than 0.1%, sintering densification is remarkably promoted, meanwhile, rare earth doped phases and grain boundary precipitated phases are generated in the composite ceramic due to introduction of the rare earth metal powder, and the sintering density is improved. Grain growth is hindered, the element diffusion rate of the grain boundary is reduced, and the obdurability of the material is improved; in the high-temperature ablation process, rare earth elements are combined with SiO2 to form a Re-Si-O phase, the stability of a glass phase is improved, and the ablation resistance of the ultrahigh-temperature ceramic matrix composite material is improved.
本发明涉及超高温陶瓷技术领域，公开了一种超高温陶瓷基复合材料及其制备方法，该方法包括如下步骤：S1：原料粉球磨混合及稀土金属元素引入，S2：粉体氢气还原，S3：粉体烧结。本发明通过在超高温陶瓷原料粉中加入稀土元素金属粉进行球磨混合，并对混合粉体进行氢气还原，使复合陶瓷的氧含量低于0.1％，显著促进烧结致密化，同时稀土金属粉的引入导致复合陶瓷中产生稀土掺杂相和晶界析出相，阻碍晶粒长大并降低了晶界的元素扩散速率，提高了材料的强韧性；在高温烧蚀过程中稀土元素与SiO2结合形成Re‑Si‑O相，提高玻璃相的稳定性，使得超高温陶瓷基复合材料的抗烧蚀性能得到了提高。
Ultrahigh-temperature ceramic-based composite material and preparation method thereof
The invention relates to the technical field of ultrahigh-temperature ceramics, and discloses an ultrahigh-temperature ceramic-based composite material and a preparation method thereof, and the method comprises the following steps: S1, raw material powder ball-milling mixing and rare earth metal element introduction, S2, powder hydrogen reduction, and S3, powder sintering. The rare earth metal powder is added into the ultrahigh-temperature ceramic raw material powder for ball milling and mixing, and the mixed powder is subjected to hydrogen reduction, so that the oxygen content of the composite ceramic is lower than 0.1%, sintering densification is remarkably promoted, meanwhile, rare earth doped phases and grain boundary precipitated phases are generated in the composite ceramic due to introduction of the rare earth metal powder, and the sintering density is improved. Grain growth is hindered, the element diffusion rate of the grain boundary is reduced, and the obdurability of the material is improved; in the high-temperature ablation process, rare earth elements are combined with SiO2 to form a Re-Si-O phase, the stability of a glass phase is improved, and the ablation resistance of the ultrahigh-temperature ceramic matrix composite material is improved.
本发明涉及超高温陶瓷技术领域，公开了一种超高温陶瓷基复合材料及其制备方法，该方法包括如下步骤：S1：原料粉球磨混合及稀土金属元素引入，S2：粉体氢气还原，S3：粉体烧结。本发明通过在超高温陶瓷原料粉中加入稀土元素金属粉进行球磨混合，并对混合粉体进行氢气还原，使复合陶瓷的氧含量低于0.1％，显著促进烧结致密化，同时稀土金属粉的引入导致复合陶瓷中产生稀土掺杂相和晶界析出相，阻碍晶粒长大并降低了晶界的元素扩散速率，提高了材料的强韧性；在高温烧蚀过程中稀土元素与SiO2结合形成Re‑Si‑O相，提高玻璃相的稳定性，使得超高温陶瓷基复合材料的抗烧蚀性能得到了提高。
Ultrahigh-temperature ceramic-based composite material and preparation method thereof
一种超高温陶瓷基复合材料及其制备方法
MAO XIAODONG (author) / ZHEN QIANG (author) / ZHENG FENG (author) / LI RONG (author) / BU NAIJING (author)
2023-02-28
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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