Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Non-uniform solid solution strengthening and toughening ultrahigh-temperature composite ceramic and preparation method thereof
The invention discloses a heterogeneous solid solution strengthening and toughening ultrahigh-temperature composite ceramic and a preparation method of the ultrahigh-temperature composite ceramic, and the method comprises the following steps: synthesizing particle size-controllable multi-element ultrahigh-temperature ceramic powder, regulating and controlling the Poisson ratio of a transition element compound sintered product, including at least two of Hf, Ta, Zr, W, Ti and Nb metal elements and at least one of C, B and N non-metal elements; the preparation method comprises the following steps: by taking a low-temperature sintering furnace and a sintering aid, especially SiC, MoSi2, Ta, W, SiO2, ZrO2, HfO2 and Hf6Ta2O17 powder, as auxiliary materials, carrying out spark plasma sintering or hot pressed sintering under the sintering condition of lower than 2000 DEG C to obtain the fully-densified non-uniform solid solution ultrahigh-temperature composite ceramic, and regulating and controlling the nonuniformity of valence electron concentration for controlling ductile-brittle transition behavior in the ceramic, so as to obtain the high-temperature-resistant ultrahigh-temperature composite ceramic. While the hardness of the ultrahigh-temperature composite ceramic is ensured, the toughness and the high-temperature resistance are remarkably improved.
本发明公开了一种非均匀固溶强韧化的超高温复合陶瓷以及该超高温复合陶瓷的制备方法，该方法包括合成可控粒径的多元超高温陶瓷粉体，调控过渡元素化合物烧结产物的泊松比，包括Hf、Ta、Zr、W、Ti、Nb金属元素中的至少两种，C、B、N非金属元素中至少一种；以及烧结助剂尤其是SiC，MoSi2，Ta，W，SiO2，ZrO2，HfO2，Hf6Ta2O17粉体为辅料，采用放电等离子烧结或热压烧结，在低于2000℃的温度烧结条件下获得全致密化的非均匀固溶的超高温复合陶瓷，通过调控陶瓷中控制韧脆转变行为的价电子浓度的不均匀性，在保证超高温复合陶瓷硬度的同时，使得韧性和耐高温性能显著提高。
Non-uniform solid solution strengthening and toughening ultrahigh-temperature composite ceramic and preparation method thereof
The invention discloses a heterogeneous solid solution strengthening and toughening ultrahigh-temperature composite ceramic and a preparation method of the ultrahigh-temperature composite ceramic, and the method comprises the following steps: synthesizing particle size-controllable multi-element ultrahigh-temperature ceramic powder, regulating and controlling the Poisson ratio of a transition element compound sintered product, including at least two of Hf, Ta, Zr, W, Ti and Nb metal elements and at least one of C, B and N non-metal elements; the preparation method comprises the following steps: by taking a low-temperature sintering furnace and a sintering aid, especially SiC, MoSi2, Ta, W, SiO2, ZrO2, HfO2 and Hf6Ta2O17 powder, as auxiliary materials, carrying out spark plasma sintering or hot pressed sintering under the sintering condition of lower than 2000 DEG C to obtain the fully-densified non-uniform solid solution ultrahigh-temperature composite ceramic, and regulating and controlling the nonuniformity of valence electron concentration for controlling ductile-brittle transition behavior in the ceramic, so as to obtain the high-temperature-resistant ultrahigh-temperature composite ceramic. While the hardness of the ultrahigh-temperature composite ceramic is ensured, the toughness and the high-temperature resistance are remarkably improved.
本发明公开了一种非均匀固溶强韧化的超高温复合陶瓷以及该超高温复合陶瓷的制备方法，该方法包括合成可控粒径的多元超高温陶瓷粉体，调控过渡元素化合物烧结产物的泊松比，包括Hf、Ta、Zr、W、Ti、Nb金属元素中的至少两种，C、B、N非金属元素中至少一种；以及烧结助剂尤其是SiC，MoSi2，Ta，W，SiO2，ZrO2，HfO2，Hf6Ta2O17粉体为辅料，采用放电等离子烧结或热压烧结，在低于2000℃的温度烧结条件下获得全致密化的非均匀固溶的超高温复合陶瓷，通过调控陶瓷中控制韧脆转变行为的价电子浓度的不均匀性，在保证超高温复合陶瓷硬度的同时，使得韧性和耐高温性能显著提高。
Non-uniform solid solution strengthening and toughening ultrahigh-temperature composite ceramic and preparation method thereof
非均匀固溶强韧化的超高温复合陶瓷及其制备方法
TAN ZHENYU (Autor:in) / NIE MIN (Autor:in) / PAN TIANTIAN (Autor:in) / PENG YINGBIAO (Autor:in)
29.11.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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