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    • 2. 发明授权
    • Method for manufacturing high toughness sintered bodies
    • 制造高韧性烧结体的方法
    • US4626518A
    • 1986-12-02
    • US610459
    • 1984-07-11
    • Masakazu WatanabeSatoshi IioYasushi Matsuo
    • Masakazu WatanabeSatoshi IioYasushi Matsuo
    • C04B35/119C04B35/486C04B35/488C04B35/58C04B35/48C04B35/10
    • C04B35/58014C04B35/119C04B35/486C04B35/488C04B35/4885C04B2235/666
    • A method for manufacture of a high toughness sintered body, characterized by sintering a shaped body of a mixed powder consisting essentially of from 40 to 70% by weight of a first component of powdered ZrO.sub.2 containing at least one stabilizer selected from the group consisting of Y.sub.2 O.sub.3, CaO, and MgO and having an average particle diameter of not more than 1.mu. and from 30 to 60% by weight of a second component of powdered .alpha.-Al.sub.2 O.sub.3 having an average particle diameter of not more than 1 .mu.m, which mixed powder may also contain not more than 3% by weight of SiO.sub.2, not more than 0.5% by weight of Fe.sub.2 O.sub.3, or not more than 0.5% by weight of TiO.sub.2 in a combined proportion of not more than 3% by weight at a temperature in the range of from 1400.degree. C. to 1600.degree. C. under normal pressure thereby producing a sintered body wherein at least 90% by weight of ZrO.sub.2 particles present therein are accounted for by tetragonal and cubic crystals, the ratio of said tetragonal crystals to said cubic crystals is at least 1:3, and the average crystal particle diameter of the entire sintered body is at least 3.mu..
    • 一种制造高韧性烧结体的方法,其特征在于,烧结混合粉末的成形体,所述混合粉末主要由40至70重量%的含有至少一种选自Y 2 O 3的稳定剂的粉末状ZrO 2的第一组分组成, CaO,MgO,平均粒径为1μm以下,平均粒径为1μm以下的粉末状α-Al2O3粉末的第二成分的平均粒径为1〜30重量%,混合粉末 还可以含有不超过3重量%的SiO 2,不超过0.5重量%的Fe 2 O 3,或不超过0.5重量%的TiO 2,其组合比例不超过3重量% 范围在常压下为1400℃至1600℃,从而生产烧结体,其中存在至少90重量%的存在于其中的ZrO 2颗粒为四方晶体和立方晶体,所述四方晶体与所述立方晶体的比率 结晶 Als至少为1:3,整个烧结体的平均晶粒直径至少为3微米。
    • 7. 发明授权
    • Process for the production of silicon nitride sintered bodies
    • 制造氮化硅烧结体的方法
    • US4521358A
    • 1985-06-04
    • US521283
    • 1983-08-08
    • Kazunori MiuraYoshinori HattoriYasushi Matsuo
    • Kazunori MiuraYoshinori HattoriYasushi Matsuo
    • C04B35/591C04B35/593F02B3/06C04B35/58
    • C04B35/593C04B35/591F02B3/06
    • Processes for the production of a silicon nitride sintered body are disclosed. One process comprises molding a mixed powder of 100 parts by weight of metallic silicon with a maximum particle size of 20 .mu.m or less and 0.2 to 2 parts by weight (calculated as chromium oxide) of a chromium component and, thereafter, reaction sintering the mold in a nitrogen gas or in a non-oxidizing atmosphere containing nitrogen gas at a temperature of 1,300.degree. to 1,500.degree. C. This invention provides further process which comprises molding a mixed powder of 100 parts by weight of metallic silicon with a maximum particle size of 20 .mu.m or less, 0.2 to 1 part by weight (calculated as chromium oxide) of a chromium component, and further 10 to 20 parts by weight of an oxide component of one or more of the oxides of yttrium, lanthanum, cerium, gadolinium, and erbium, reaction sintering the above-prepared mold, and thereafter, hot pressing the reaction sintered body. This silicon nitride hot pressed body is superior in oxidation resistance, and moreover is of high density and has high mechanical strength. Thus it is suitable for use as, e.g., gas turbine parts of diesel engine parts.
    • 公开了制造氮化硅烧结体的方法。 一种方法包括:将100重量份最大粒度为20μm或更小的金属硅和0.2至2重量份(以铬氧化物计)的铬组分的混合粉末模塑,然后将 在氮气中或在含有氮气的非氧化性气氛中在1300〜1500℃的温度下成型。本发明提供了进一步的方法,其包括将最大粒径为100重量份的金属硅的混合粉末 20μm以下,0.2〜1重量份(以氧化铬计算)的铬成分,还含有10〜20重量份的氧化物成分,一种或多种钇,镧,铈, 钆和铒,对上述制备的模具进行反应烧结,然后热压该反应烧结体。 该氮化硅热压体的耐氧化性优异,而且密度高,机械强度高。 因此,它适用于例如柴油发动机部件的燃气轮机部件。