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B4C-mullite-NbB2 composite ceramic and preparation method thereof
The invention relates to a B4C-mullite-NbB2 composite ceramic and a preparation method of the B4C-mullite-NbB2 composite ceramic. According to the technical scheme, the preparation method comprises the following steps: by taking 45-78wt% of boron carbide powder, 18-40wt% of light mullite and 4-15wt% of niobium aluminum carbide as raw materials, mixing the boron carbide powder and the niobium aluminum carbide, adding the light mullite, continuously mixing, and drying; mixing the dried mixed powder with a polyvinyl alcohol aqueous solution, and carrying out cold press molding; placing the formed block in a graphite mold, then transferring the graphite mold into a hot-pressing furnace, heating the hot-pressing furnace to 1200-1600 DEG C under a vacuum condition at a rate of 8-15 DEG C/min, then carrying out hot-pressing sintering on the block in the mold under a condition of 20-60 MPa, and carrying out heat preservation and pressure maintaining for 1-5 hours; and then cooling to 950-1000 DEG C at a rate of 5-10 DEG C/min and reducing the pressure to 10-20 MPa at a constant speed in the same time period, and finally unloading the mold and cooling to room temperature at an original rate to prepare the B4C-mullite-NbB2 composite ceramic. The preparation method is simple in process, low in sintering temperature and low in energy consumption, and the prepared product is low in density and high in strength.
本发明涉及一种B4C‑莫来石‑NbB2复合陶瓷及其制备方法。其技术方案是：以45～78wt％碳化硼粉末、18～40wt％轻质莫来石和4～15wt％铌碳化铝为原料，将碳化硼粉末和铌碳化铝混料后加入轻质莫来石继续混料，烘干；烘干的混合粉体与聚乙烯醇水溶液混合，冷压成型；成型的块体置于石墨模具后移至热压炉内，在真空条件下以8～15℃/min的速率将热压炉加热至1200～1600℃，再对模具内的块体在20～60MPa条件下热压烧结，保温保压1～5h；然后在相同时间段以5～10℃/min的速率降温至950～1000℃和匀速降压至10～20MPa，最后对模具卸载和以原来的速率降至室温，制得B4C‑莫来石‑NbB2复合陶瓷。本发明工艺简单、烧结温度低和能耗小，所制制品密度小和强度高。
B4C-mullite-NbB2 composite ceramic and preparation method thereof
The invention relates to a B4C-mullite-NbB2 composite ceramic and a preparation method of the B4C-mullite-NbB2 composite ceramic. According to the technical scheme, the preparation method comprises the following steps: by taking 45-78wt% of boron carbide powder, 18-40wt% of light mullite and 4-15wt% of niobium aluminum carbide as raw materials, mixing the boron carbide powder and the niobium aluminum carbide, adding the light mullite, continuously mixing, and drying; mixing the dried mixed powder with a polyvinyl alcohol aqueous solution, and carrying out cold press molding; placing the formed block in a graphite mold, then transferring the graphite mold into a hot-pressing furnace, heating the hot-pressing furnace to 1200-1600 DEG C under a vacuum condition at a rate of 8-15 DEG C/min, then carrying out hot-pressing sintering on the block in the mold under a condition of 20-60 MPa, and carrying out heat preservation and pressure maintaining for 1-5 hours; and then cooling to 950-1000 DEG C at a rate of 5-10 DEG C/min and reducing the pressure to 10-20 MPa at a constant speed in the same time period, and finally unloading the mold and cooling to room temperature at an original rate to prepare the B4C-mullite-NbB2 composite ceramic. The preparation method is simple in process, low in sintering temperature and low in energy consumption, and the prepared product is low in density and high in strength.
本发明涉及一种B4C‑莫来石‑NbB2复合陶瓷及其制备方法。其技术方案是：以45～78wt％碳化硼粉末、18～40wt％轻质莫来石和4～15wt％铌碳化铝为原料，将碳化硼粉末和铌碳化铝混料后加入轻质莫来石继续混料，烘干；烘干的混合粉体与聚乙烯醇水溶液混合，冷压成型；成型的块体置于石墨模具后移至热压炉内，在真空条件下以8～15℃/min的速率将热压炉加热至1200～1600℃，再对模具内的块体在20～60MPa条件下热压烧结，保温保压1～5h；然后在相同时间段以5～10℃/min的速率降温至950～1000℃和匀速降压至10～20MPa，最后对模具卸载和以原来的速率降至室温，制得B4C‑莫来石‑NbB2复合陶瓷。本发明工艺简单、烧结温度低和能耗小，所制制品密度小和强度高。
B4C-mullite-NbB2 composite ceramic and preparation method thereof
一种B4C-莫来石-NbB2复合陶瓷及其制备方法
LI XIANGCHENG (author) / HUO SHAOHUA (author) / CHEN PING'AN (author) / ZHU YINGLI (author) / ZHU BOQUAN (author)
2023-04-14
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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