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ZrN-based ultra-high-temperature ceramic and hot-pressing reaction sintering preparation method thereof
The invention provides ZrN-based ultra-high-temperature ceramic. The main phase of the ZrN-based ultra-high-temperature ceramic comprises ZrN and La4.67Si3O13, the La4.67Si3O13 is uniformly and continuously distributed among ZrN crystal grain gaps, and the size of the ZrN crystal grains is 20-50 [mu]m. The volume density of the ceramic ranges from 87% to 98%, the hardness ranges from 10.0 GPa to 11.5 GPa, the bending strength ranges from 240 MPa to 310 MPa, and the fracture toughness ranges from 1.90 MPa.m<1/2> to 2.05 MPa.m<1/2>. The invention also provides a hot-pressing reaction sintering preparation method of the ZrN-based ultra-high-temperature ceramic, which comprises the following steps: weighing alpha-Si3N4, ZrO2, La2O3, Zr powder and ZrN powder according to a molar ratio of 3:9:7:3:(22-66), adding a proper amount of an auxiliary agent, carrying out ball milling treatment, conducting drying and grinding, and sequentially carrying out molding treatment and hot-pressing sintering treatment to obtain the ZrN-based ultra-high-temperature ceramic.
本发明提供一种ZrN基超高温陶瓷，其主相包括ZrN、La4.67Si3O13，其中，La4.67Si3O13均匀连续分布于ZrN晶粒间隙间，ZrN晶粒尺寸为20‑50μm；该陶瓷的体积密度为87％‑98％，硬度10.0‑11.5GPa，抗弯强度为240‑310MPa，断裂韧性为1.90‑2.05MPa.m1/2。还提供一种ZrN基超高温陶瓷的热压反应烧结制备方法，包括：称取摩尔比为3:9:7:3:(22‑66)的α‑Si3N4、ZrO2、La2O3、Zr粉、ZrN粉末，添加适量助剂后进行球磨处理，然后经烘干、研磨处理，再依次进行成型处理，热压烧结处理，得到ZrN基超高温陶瓷。
ZrN-based ultra-high-temperature ceramic and hot-pressing reaction sintering preparation method thereof
The invention provides ZrN-based ultra-high-temperature ceramic. The main phase of the ZrN-based ultra-high-temperature ceramic comprises ZrN and La4.67Si3O13, the La4.67Si3O13 is uniformly and continuously distributed among ZrN crystal grain gaps, and the size of the ZrN crystal grains is 20-50 [mu]m. The volume density of the ceramic ranges from 87% to 98%, the hardness ranges from 10.0 GPa to 11.5 GPa, the bending strength ranges from 240 MPa to 310 MPa, and the fracture toughness ranges from 1.90 MPa.m<1/2> to 2.05 MPa.m<1/2>. The invention also provides a hot-pressing reaction sintering preparation method of the ZrN-based ultra-high-temperature ceramic, which comprises the following steps: weighing alpha-Si3N4, ZrO2, La2O3, Zr powder and ZrN powder according to a molar ratio of 3:9:7:3:(22-66), adding a proper amount of an auxiliary agent, carrying out ball milling treatment, conducting drying and grinding, and sequentially carrying out molding treatment and hot-pressing sintering treatment to obtain the ZrN-based ultra-high-temperature ceramic.
本发明提供一种ZrN基超高温陶瓷，其主相包括ZrN、La4.67Si3O13，其中，La4.67Si3O13均匀连续分布于ZrN晶粒间隙间，ZrN晶粒尺寸为20‑50μm；该陶瓷的体积密度为87％‑98％，硬度10.0‑11.5GPa，抗弯强度为240‑310MPa，断裂韧性为1.90‑2.05MPa.m1/2。还提供一种ZrN基超高温陶瓷的热压反应烧结制备方法，包括：称取摩尔比为3:9:7:3:(22‑66)的α‑Si3N4、ZrO2、La2O3、Zr粉、ZrN粉末，添加适量助剂后进行球磨处理，然后经烘干、研磨处理，再依次进行成型处理，热压烧结处理，得到ZrN基超高温陶瓷。
ZrN-based ultra-high-temperature ceramic and hot-pressing reaction sintering preparation method thereof
一种ZrN基超高温陶瓷及其热压反应烧结制备方法
LU YOUJUN (Autor:in) / LIU YANG (Autor:in) / YUAN ZHENXIA (Autor:in) / LI YANRUI (Autor:in) / LIU XIANG (Autor:in)
28.05.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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