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    • 6. 发明授权
    • Stable ceramic consisting of aluminum oxide
    • 由氧化铝组成的稳定陶瓷
    • US5030602A
    • 1991-07-09
    • US381716
    • 1989-02-27
    • Thomas FreyKarl-Hermann FrieseHeinz Geier
    • Thomas FreyKarl-Hermann FrieseHeinz Geier
    • C04B35/10C04B35/111
    • C04B35/111
    • A ceramic consisting substantially of Al.sub.2 O.sub.3 as ceramic support, ceramic cover layer and/or ceramic supporting structure for heating conductors is described, which is electrochemically stable, which, in other words, does not decompose on application of a heating voltage, even in long-term operation at temperatures above 600.degree.. Such a ceramic exhibits a very small alkali metal content, of less than 0.2% by weight Na.sub.2 O and K.sub.2 O respectively. Particularly favorable processing, in particular pressing properties are exhibited by such a ceramic if it has 2.5 to 10% by weight of barium silicate or strontium silicate fluxes, the proportions of Na.sub.2 O, K.sub.2 O, CaO and MgO together make up less than 1% by weight, and the BaO or SrO:SiO.sub.2 molar ratio is between 2:1 and 1:12.5. Such a ceramic with a BaO:SiO.sub.2 ratio of 2.6:1 parts by weight is electrochemically stable up to approximately 1400.degree. C., and at 1300.degree. C. still exhibits a bending strength of approximately 300 N/mm.sup.2.
    • PCT No.PCT / DE87 / 00285 Sec。 371日期1989年2月27日 102(e)日期1989年2月27日PCT Filed 1987年6月24日PCT公布。 出版物WO88 / 01610 日期:1988年3月10日。描述了一种基本上由作为陶瓷载体的Al 2 O 3组成的陶瓷,描述了用于加热导体的陶瓷覆盖层和/或陶瓷支撑结构,其是电化学稳定的,换句话说,其不应用于 加热电压,即使在高于600度的温度下长期运行。 这种陶瓷表现出非常小的碱金属含量,分别小于0.2重量%的Na 2 O和K 2 O 3。 如果具有2.5至10重量%的硅酸钡或硅酸锶焊剂,则通过这种陶瓷表现出特别有利的加工,特别是压制性能,Na 2 O,K 2 O,CaO和MgO的比例一起构成小于1重量% ,BaO或SrO:SiO2的摩尔比为2:1〜1:12.5。 这种BaO:SiO 2比例为2.6:1重量份的陶瓷的电化学稳定性高达约1400℃,在1300℃下仍具有约300N / mm2的弯曲强度。