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    • 4. 发明授权
    • Zirconia ceramics and method for producing same
    • 氧化锆陶瓷及其制造方法
    • US4977114A
    • 1990-12-11
    • US438946
    • 1989-11-17
    • Kazuo HorinouchiKatsuya Maeda
    • Kazuo HorinouchiKatsuya Maeda
    • C04B35/48C04B35/486
    • C04B35/486
    • Disclosed are zirconia ceramics superior in mechanical strength, hardness and toughness and a method for producing them. The zirconia ceramics contain ca. 7-12 mol % of cerium oxide and ca. 2-7 mol % of magnesium oxide and have an average crystal grain size of crystal grains thereof of 1 .mu.m or less, at least ca. 80 mol % of the crystal grains being tetragonal grains and the balance being monoclinic grains, and have a bending strength of at least 100 kg/mm.sup.2, a fracture toughness of at least 10 MNm.sup.-1.5 and a Vickers hardness of at least 1000 kg/mm.sup.2. The method comprises calcining a hydrate obtained by coprecipitation method from water-soluble salts of cerium and magnesium and a basic salt of zirconium or a hydrate obtained by adding water-soluble salts of cerium and magnesium to a zirconium hydrate and neutralizing the mixture of hydrates, further grinding the calcined hydrate to obtain zirconia powders of 1 .mu.m or less in average crystal grain size, then shaping the powders and sintering the resulting shaped product.
    • 公开了机械强度,硬度和韧性优异的氧化锆陶瓷及其制造方法。 氧化锆陶瓷含有 7-12摩尔%的氧化铈和约 2-7mol%的氧化镁,其晶粒的平均晶粒尺寸为1μm以下,至少约为。 80μmol%的晶粒为四方晶粒,余量为单斜晶粒,弯曲强度为至少100kg / mm2,断裂韧性为至少10MNm-1.5,维氏硬度至少为1000kg / mm2。 该方法包括通过共沉淀法从铈和镁的水溶性盐和通过向水合锆中加入铈和镁的水溶性盐而得到的锆或水合物的碱式盐,并且中和水合物的混合物, 进一步研磨煅烧水合物,得到平均晶粒尺寸为1μm以下的氧化锆粉末,然后成形粉末并烧结所得成型体。