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Large-size zirconia ceramic and preparation method thereof
The invention relates to a large-size zirconia ceramic and a preparation method thereof.The zirconia ceramic comprises, by weight, 91-95% of monoclinic zirconia, 0-1% of lanthanum trioxide and 3-8% of magnesia-calcium sand, a wet ball milling technology is adopted in the preparation process, and powder obtained after ball milling and drying is subjected to compression molding under 120-180 MPa and then sintered at 1600-1700 DEG C to obtain the large-size zirconia ceramic. According to the invention, MgO and CaO in the natural magnesia-calcium sand are utilized to stabilize zirconium oxide, and micro impurities in the magnesia-calcium sand are in a liquid phase at high temperature, so that sintering can be promoted, and the sintering temperature is reduced; and a small amount of liquid phase relieves thermal stress at high temperature, the large-size zirconia ceramic is prevented from cracking, and the yield is increased. In addition, the magnesia-calcium sand is hydrated to generate a small amount of Mg (OH) 2 and Ca (OH) 2 to play a binding role, and a binding agent does not need to be additionally added. The zirconia ceramic prepared by the method has the advantages of low energy consumption, low cost, stable volume and the like.
本发明涉及一种大尺寸氧化锆陶瓷及其制备方法，所述氧化锆陶瓷包括以按照重量百分比计，包括91～95%的单斜氧化锆，0～1%的三氧化二镧，3～8%的镁钙砂，制备过程采用湿法球磨工艺，球磨干燥后的粉料在120～180MPa下压制成型，于1600～1700℃烧成后得到大尺寸氧化锆陶瓷。本发明利用天然镁钙砂中的MgO和CaO来稳定氧化锆，镁钙砂中的微杂质在高温下呈液相，可促进烧结，降低烧成温度；且少量液相高温下缓解热应力，防止大尺寸氧化锆陶瓷开裂，提高成品率。此外，镁钙砂水化生成少量的Mg(OH)2和Ca(OH)2起结合作用，不需另加结合剂。该方法制备的氧化锆陶瓷具有低能耗、低成本和体积稳定等优点。
Large-size zirconia ceramic and preparation method thereof
The invention relates to a large-size zirconia ceramic and a preparation method thereof.The zirconia ceramic comprises, by weight, 91-95% of monoclinic zirconia, 0-1% of lanthanum trioxide and 3-8% of magnesia-calcium sand, a wet ball milling technology is adopted in the preparation process, and powder obtained after ball milling and drying is subjected to compression molding under 120-180 MPa and then sintered at 1600-1700 DEG C to obtain the large-size zirconia ceramic. According to the invention, MgO and CaO in the natural magnesia-calcium sand are utilized to stabilize zirconium oxide, and micro impurities in the magnesia-calcium sand are in a liquid phase at high temperature, so that sintering can be promoted, and the sintering temperature is reduced; and a small amount of liquid phase relieves thermal stress at high temperature, the large-size zirconia ceramic is prevented from cracking, and the yield is increased. In addition, the magnesia-calcium sand is hydrated to generate a small amount of Mg (OH) 2 and Ca (OH) 2 to play a binding role, and a binding agent does not need to be additionally added. The zirconia ceramic prepared by the method has the advantages of low energy consumption, low cost, stable volume and the like.
本发明涉及一种大尺寸氧化锆陶瓷及其制备方法，所述氧化锆陶瓷包括以按照重量百分比计，包括91～95%的单斜氧化锆，0～1%的三氧化二镧，3～8%的镁钙砂，制备过程采用湿法球磨工艺，球磨干燥后的粉料在120～180MPa下压制成型，于1600～1700℃烧成后得到大尺寸氧化锆陶瓷。本发明利用天然镁钙砂中的MgO和CaO来稳定氧化锆，镁钙砂中的微杂质在高温下呈液相，可促进烧结，降低烧成温度；且少量液相高温下缓解热应力，防止大尺寸氧化锆陶瓷开裂，提高成品率。此外，镁钙砂水化生成少量的Mg(OH)2和Ca(OH)2起结合作用，不需另加结合剂。该方法制备的氧化锆陶瓷具有低能耗、低成本和体积稳定等优点。
Large-size zirconia ceramic and preparation method thereof
一种大尺寸氧化锆陶瓷及其制备方法
LIU XINHONG (author) / TIAN XUEKUN (author) / SHEN JIAXIN (author) / CUI SHUBIN (author) / LIU YECONG (author) / SU KAI (author) / ZHAO ZHENYI (author) / LIU XUSHENG (author)
2024-02-23
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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