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High-entropy boride reinforced and toughened silicon nitride composite ceramic as well as preparation method and application thereof
The invention belongs to the technical field of non-oxide-based ceramics, and discloses a high-entropy boride reinforced and toughened silicon nitride composite ceramic as well as a preparation method and application thereof. The composite ceramic is prepared by the following steps: performing high-energy shear mixing treatment on alpha-Si3N4 powder, a sintering aid MgO-Re2O3 and a high-entropy boride HEB2, heating the obtained mixed powder to 1450-1550 DEG C in an argon atmosphere, preserving heat, axially pressurizing to 10-50 MPa in the heat preservation process, and performing hot pressed sintering. The content of alpha-Si3N4 in the ceramic is lower than 50 wt%, the relative density of the ceramic is 97-100%, the hardness of the ceramic is 19-25 GPa, the fracture toughness of the ceramic is 5-10 MPa.m < 1/2 >, and the bending strength of the ceramic is 500-1000 MPa. According to the invention, low-temperature hot pressed sintering is adopted, and the HEB2 powder is introduced, so that on the premise of ensuring high hardness, silicon nitride phase change at low temperature is realized, and the bending strength and fracture toughness of the silicon nitride ceramic are improved.
本发明属于非氧化物基陶瓷技术领域，公开了一种高熵硼化物增强增韧氮化硅的复合陶瓷及其制备方法和应用。该复合陶瓷是将α‑Si3N4粉、烧结助剂MgO‑Re2O3、高熵硼化物HEB2进行高能剪切混合处理，将所得混合粉体在氩气气氛下，升温至1450～1550℃并保温，保温过程轴向加压为10～50MPa，经热压烧结制得。该陶瓷α‑Si3N4的含量低于50wt％，相对密度为97～100％，硬度为19～25GPa，断裂韧性为5～10MPa·m1/2，抗弯强度为500～1000MPa。本发明采用低温热压烧结，通过引入HEB2粉，在保证高硬度的前提下，实现低温下氮化硅相变，提高氮化硅陶瓷的抗弯强度和断裂韧性。
High-entropy boride reinforced and toughened silicon nitride composite ceramic as well as preparation method and application thereof
The invention belongs to the technical field of non-oxide-based ceramics, and discloses a high-entropy boride reinforced and toughened silicon nitride composite ceramic as well as a preparation method and application thereof. The composite ceramic is prepared by the following steps: performing high-energy shear mixing treatment on alpha-Si3N4 powder, a sintering aid MgO-Re2O3 and a high-entropy boride HEB2, heating the obtained mixed powder to 1450-1550 DEG C in an argon atmosphere, preserving heat, axially pressurizing to 10-50 MPa in the heat preservation process, and performing hot pressed sintering. The content of alpha-Si3N4 in the ceramic is lower than 50 wt%, the relative density of the ceramic is 97-100%, the hardness of the ceramic is 19-25 GPa, the fracture toughness of the ceramic is 5-10 MPa.m < 1/2 >, and the bending strength of the ceramic is 500-1000 MPa. According to the invention, low-temperature hot pressed sintering is adopted, and the HEB2 powder is introduced, so that on the premise of ensuring high hardness, silicon nitride phase change at low temperature is realized, and the bending strength and fracture toughness of the silicon nitride ceramic are improved.
本发明属于非氧化物基陶瓷技术领域，公开了一种高熵硼化物增强增韧氮化硅的复合陶瓷及其制备方法和应用。该复合陶瓷是将α‑Si3N4粉、烧结助剂MgO‑Re2O3、高熵硼化物HEB2进行高能剪切混合处理，将所得混合粉体在氩气气氛下，升温至1450～1550℃并保温，保温过程轴向加压为10～50MPa，经热压烧结制得。该陶瓷α‑Si3N4的含量低于50wt％，相对密度为97～100％，硬度为19～25GPa，断裂韧性为5～10MPa·m1/2，抗弯强度为500～1000MPa。本发明采用低温热压烧结，通过引入HEB2粉，在保证高硬度的前提下，实现低温下氮化硅相变，提高氮化硅陶瓷的抗弯强度和断裂韧性。
High-entropy boride reinforced and toughened silicon nitride composite ceramic as well as preparation method and application thereof
一种高熵硼化物增强增韧氮化硅的复合陶瓷及其制备方法和应用
GUO WEIMING (author) / ZENG XIANMING (author) / YU JUNJIE (author) / LIANG ZHENQUAN (author) / LIN HUATAI (author)
2023-10-31
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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