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Long-rod-shaped beta-SiAlON toughened high-entropy carbide ceramic as well as preparation method and application thereof
The invention belongs to the field of high-entropy ceramic materials, and discloses a long-rod-shaped beta-SiAlON toughened high-entropy carbide ceramic as well as a preparation method and application thereof. The high-entropy carbide ceramic is prepared by the following steps: mixing any five carbides of micron-sized high-purity TiC, ZrC, HfC, VC, WC, TaC and NbC according to an equal molar ratio to serve as a high-entropy carbide ceramic matrix, then adding Si3N4, Al2O3, AlN and a sintering aid Y2O3, and carrying out ball milling to obtain mixed powder; sub-packaging the powder into a graphite mold, axially applying a pressure of 30-40 MPa under a protective atmosphere, heating to 1850-2200 DEG C, and carrying out SPS sintering to obtain the high-entropy carbide ceramic. According to the invention, the Si3N4, Al2O3 and AlN are added into high-entropy carbide and sintered to form long-rod-shaped beta-SiAlON, so that the high-entropy carbide ceramic is toughened; besides, the fracture toughness and bending strength of the high-entropy carbide ceramic are improved, and the sintering density of the material is improved.
本发明属于高熵陶瓷材料领域，公开了一种长棒状β‑SiAlON增韧的高熵碳化物陶瓷及制备方法和应用。该高熵碳化物陶瓷是将微米级高纯度的TiC、ZrC、HfC、VC、WC、TaC、NbC中的任意五种碳化物等摩尔比混合作为高熵碳化物陶瓷基体，再加入Si3N4、Al2O3、AlN与烧结助剂Y2O3，经球磨得到混合粉体；分装入石墨模具中，在保护气氛下轴向施加压力30～40MPa，升温至1850～2200℃进行SPS烧结得到高熵碳化物陶瓷；本发明通过在高熵碳化物中加入Si3N4、Al2O3、AlN，烧结形成长棒状的β‑SiAlON实现对高熵碳化物陶瓷的增韧，提高其断裂韧性与抗弯强度，提高材料的烧结致密度。
Long-rod-shaped beta-SiAlON toughened high-entropy carbide ceramic as well as preparation method and application thereof
The invention belongs to the field of high-entropy ceramic materials, and discloses a long-rod-shaped beta-SiAlON toughened high-entropy carbide ceramic as well as a preparation method and application thereof. The high-entropy carbide ceramic is prepared by the following steps: mixing any five carbides of micron-sized high-purity TiC, ZrC, HfC, VC, WC, TaC and NbC according to an equal molar ratio to serve as a high-entropy carbide ceramic matrix, then adding Si3N4, Al2O3, AlN and a sintering aid Y2O3, and carrying out ball milling to obtain mixed powder; sub-packaging the powder into a graphite mold, axially applying a pressure of 30-40 MPa under a protective atmosphere, heating to 1850-2200 DEG C, and carrying out SPS sintering to obtain the high-entropy carbide ceramic. According to the invention, the Si3N4, Al2O3 and AlN are added into high-entropy carbide and sintered to form long-rod-shaped beta-SiAlON, so that the high-entropy carbide ceramic is toughened; besides, the fracture toughness and bending strength of the high-entropy carbide ceramic are improved, and the sintering density of the material is improved.
本发明属于高熵陶瓷材料领域，公开了一种长棒状β‑SiAlON增韧的高熵碳化物陶瓷及制备方法和应用。该高熵碳化物陶瓷是将微米级高纯度的TiC、ZrC、HfC、VC、WC、TaC、NbC中的任意五种碳化物等摩尔比混合作为高熵碳化物陶瓷基体，再加入Si3N4、Al2O3、AlN与烧结助剂Y2O3，经球磨得到混合粉体；分装入石墨模具中，在保护气氛下轴向施加压力30～40MPa，升温至1850～2200℃进行SPS烧结得到高熵碳化物陶瓷；本发明通过在高熵碳化物中加入Si3N4、Al2O3、AlN，烧结形成长棒状的β‑SiAlON实现对高熵碳化物陶瓷的增韧，提高其断裂韧性与抗弯强度，提高材料的烧结致密度。
Long-rod-shaped beta-SiAlON toughened high-entropy carbide ceramic as well as preparation method and application thereof
一种长棒状β-SiAlON增韧的高熵碳化物陶瓷及其制备方法和应用
GUO WEIMING (Autor:in) / ZHOU YUZHANG (Autor:in) / LUO SICHUN (Autor:in) / LIN HUATAI (Autor:in)
17.09.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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