公开(公告)号：US4929417A

公开(公告)日：1990-05-29

申请号：US341461

申请日：1989-04-21

申请人： Tadahiko Watanabe ,  Kazuhisa Shobu ,  Yukio Kai ,  Hideki Yamamoto ,  Eiichi Sudoh ,  Osamu Yagishita ,  Junshiro Hayakawa

发明人： Tadahiko Watanabe ,  Kazuhisa Shobu ,  Yukio Kai ,  Hideki Yamamoto ,  Eiichi Sudoh ,  Osamu Yagishita ,  Junshiro Hayakawa

IPC分类号： C04B35/58

CPC分类号： C04B35/645 ,  C04B35/58071 ,  C04B35/58078

摘要： A powder of at least one of TiB.sub.2, ZrB.sub.2 and HfB.sub.2 is mixed with at least one of Ti, Zr, Hf, TiB, ZrB and HfB, or with at least one of Ti, Zr, Hf, TiB, ZrB and HfB and a powder of boron, to prepare a mixed powder which can form a sintered product having a boron content of 65 to 67 atom %. Alternatively, a powder of at least one of Ti, Zr, Hf, TiB, ZrB and HfB is mixed with a powder of boron to prepare the mixed powder. The mixed powder may further contain up to a maximum of 30% by weight of a powder of AlN. Then, the mixed powder is sintered to make metal diboride ceramics. The lower-melting metal or compound which the mixed powder contains melts to form a liquid phase and enables the manufacture of a sintered product of high density by a customary sintering operation employing a low temperature. The sintered product having a boron content of 65 to 67 atom % consists solely of metal diboride crystals having a structure of the hexagonal system.

摘要翻译： 将TiB2，ZrB2和HfB2中的至少一种的粉末与Ti，Zr，Hf，TiB，ZrB和HfB中的至少一种，或与Ti，Zr，Hf，TiB，ZrB和HfB中的至少一种混合，以及 硼粉末，制成可形成硼含量为65〜67原子％的烧结体的混合粉末。 或者，将Ti，Zr，Hf，TiB，ZrB和HfB中的至少一种的粉末与硼粉末混合以制备混合粉末。 混合粉末还可以含有最多达30重量％的AlN粉末。 然后，将混合粉末烧结成金属二硼化物陶瓷。 混合粉末含有的低熔点金属或化合物熔融形成液相，并且能够通过采用低温的常规烧结操作制造高密度烧结产品。 硼含量为65〜67原子％的烧结体仅由具有六方晶系结构的金属二硼化物晶体构成。

公开(公告)号：US4948425A

公开(公告)日：1990-08-14

申请号：US334219

申请日：1989-04-06

申请人： Tadahiko Watanabe ,  Tsuyoshi Doutsu ,  Osamu Yagishita ,  Hideki Yamamoto ,  Yukio Kai

发明人： Tadahiko Watanabe ,  Tsuyoshi Doutsu ,  Osamu Yagishita ,  Hideki Yamamoto ,  Yukio Kai

IPC分类号： C04B35/56 ,  C04B35/58 ,  C22C29/02 ,  C22C29/04

CPC分类号： C04B35/645 ,  C04B35/56 ,  C04B35/58021 ,  C22C29/04

摘要： New ceramics have excellent mechanical properties such as high density, strength, hardness and toughness. The new ceramics are prepared by sintering a mixture prepared by adding 1 to 90 percent by weight of chromium carbide to titanium carbo-nitride together with some elements selected from the group of transition metals of groups IV, V, VI and VII, ferrous metals and semi-metals. For some types of new ceramics, boron carbide is added, too.

摘要翻译： 新型陶瓷具有优异的机械性能，如高密度，强度，硬度和韧性。 通过将通过将1至90重量％的碳化铬加入钛碳氮化物中的一些元素与选自IV，V，VI和VII族的过渡金属的一些元素，黑色金属和 半金属。 对于某些类型的新陶瓷，也添加碳化硼。

公开(公告)号：US5036028A

公开(公告)日：1991-07-30

申请号：US511816

申请日：1990-04-18

申请人： Tadahiko Watanabe ,  Tsuyoshi Doutsu ,  Kazuhisa Shobu ,  Yukio Kai

发明人： Tadahiko Watanabe ,  Tsuyoshi Doutsu ,  Kazuhisa Shobu ,  Yukio Kai

IPC分类号： C04B35/58

CPC分类号： C04B35/5805 ,  C04B35/58064 ,  C04B35/58071 ,  C04B35/58078 ,  C04B35/645

摘要： A high density metal-boride based ceramic sintered body consists essentially of component (A) at least one of TiB.sub.2, ZrB.sub.2, CrB.sub.2, HfB.sub.2, VB.sub.2, TaB.sub.2, NbB.sub.2, MnB.sub.2, MoB.sub.2, YB.sub.2, AlB.sub.2, MgB.sub.2, CrB, VB, TaB, NbB, MoB, HfB, YB, ZrB, HfB, TiB, MnB, W.sub.2 B.sub.5 and Mo.sub.2 B.sub.5, componet (B) 0.1 wt. %-10 wt. % based on the total amount of a metal binder comprising at least one of cobalt boride, nickel boride and iron boride, and component (C) 0.1 wt. %-10 wt. % based on the total amount of at least one of a double carbide comprising Ti, Zr, W and C, ZrCN, HfCN, or a double carbo-nitride comprising Ti, Zr, Hf and C, N.The sintered body is not easily oxidized and has extremely few pores and high shock resistance even using a fine grain raw material powder because component (C) has an oxygen removing effect during sintering.

摘要翻译： 高密度金属硼化物系陶瓷烧结体主要由TiB 2，ZrB 2，CrB 2，HfB 2，VB 2，TaB 2，NbB 2，MnB 2，MoB 2，YB 2，AlB 2，MgB 2，CrB，VB，TaB ，NbB，MoB，HfB，YB，ZrB，HfB，TiB，MnB，W2B5和Mo2B5，组分（B）0.1wt。 ％-10wt。 基于包含钴硼化物，硼化镍和硼化物中的至少一种的金属粘合剂的总量的％，和组分（C）0.1重量％ ％-10wt。 基于包含Ti，Zr，W和C，ZrCN，HfCN或包含Ti，Zr，Hf和C，N的双碳氮化物中的至少一种的总量的％。烧结体不容易 氧化，并且即使使用细粒原料粉末也具有极少的孔和高抗冲击性，因为组分（C）在烧结期间具有除氧效果。

公开(公告)号：US5998322A

公开(公告)日：1999-12-07

申请号：US135528

申请日：1998-08-18

申请人： Kazutomo Hoshino ,  Toshiya Kunisaki ,  Hideaki Seto ,  Yukio Kai ,  Atsushi Kikuchi ,  Yukihisa Shiraishi ,  Kazunobu Kakimoto

发明人： Kazutomo Hoshino ,  Toshiya Kunisaki ,  Hideaki Seto ,  Yukio Kai ,  Atsushi Kikuchi ,  Yukihisa Shiraishi ,  Kazunobu Kakimoto

IPC分类号： B01D39/20 ,  B22D43/00 ,  C04B35/101 ,  C04B35/443

CPC分类号： B22D43/004 ,  B01D39/2075 ,  C04B35/1015

摘要： Herein disclosed is a filter medium for molten metals which consists of a sintered body of a mixture comprising 100 parts by weight of at least one refractory grain selected from the group consisting of alumina particles and Al.sub.2 O.sub.3.MgO spinel crystal particles; and 5 to 25 parts by weight of an inorganic binder which comprises 60 to 90% by weight of Al.sub.2 O.sub.3.MgO spinel crystal powder, 5 to 12% by weight of B.sub.2 O.sub.3, and not more than 30% by weight of at least one oxide selected from the group consisting of Al.sub.2 O.sub.3, MgO and TiO.sub.2. The filter medium is used for filtering off solid impurities mixed in molten metals, in particular, molten aluminums.

摘要翻译： 本文公开了一种用于熔融金属的过滤介质，其由包含100重量份的至少一种选自氧化铝颗粒和Al 2 O 3 .MOO尖晶石晶体颗粒的耐火材料的混合物的烧结体组成。 和5至25重量份的无机粘合剂，其包含60至90重量％的Al 2 O 3 .MgO尖晶石结晶粉末，5至12重量％的B 2 O 3和不超过30重量％的至少一种选择的氧化物 由Al2O3，MgO和TiO2组成的组。 过滤介质用于过滤在熔融金属，特别是熔融铝中混合的固体杂质。

公开(公告)号：US5667685A

公开(公告)日：1997-09-16

申请号：US677086

申请日：1996-07-09

申请人： Tadahiro Yoshida ,  Taro Kobayashi ,  Nobuhiro Okuzono ,  Yukio Kai

发明人： Tadahiro Yoshida ,  Taro Kobayashi ,  Nobuhiro Okuzono ,  Yukio Kai

IPC分类号： B01D39/20 ,  B22C9/08 ,  B22D43/00 ,  C04B35/101 ,  C04B35/63 ,  C04B38/00 ,  C22B9/02 ,  C22B21/06 ,  B01D24/00

CPC分类号： B22D43/004 ,  B01D39/2075 ,  C04B38/00 ,  C22B21/066 ,  C22B9/02 ,  C04B2103/0067 ,  C04B2111/00793 ,  C04B2111/00879 ,  Y02P10/234

摘要： A filter for the filtration of molten aluminum is obtained by binding 100 parts by weight of aggregate particles with 10 to 20 parts by weight of an inorganic binding material, said aggregate particles being composed of at least one alumina selected from the group consisting of fused alumina and sintered alumina and said inorganic binding material having a raw material composition comprising 25 wt. % to 35 wt. % of SiO.sub.2, 30 to 40 wt. % of B.sub.2 O.sub.3, 20 to 35 wt. % of Al.sub.2 O.sub.3 and the balance being MgO. A filter according to the invention has a crystallinity of from 10% to 25% with the proviso that in the powder X-ray diffraction, the crystallinity is expressed in terms of a percentage of a peak height of 9Al.sub.2 O.sub.3 .multidot.2B.sub.2 O.sub.3 appearing at 2.theta.=16.5.degree. to a peak height of .alpha.-Al.sub.2 O.sub.3 appearing at 2.theta.=43.4.degree.. Needle crystals of 9Al.sub.2 O.sub.3 .multidot.2B.sub.2 O.sub.3 which are formed in the inorganic binding material are not longer than 10 .mu.m. Needle crystals of 9Al.sub.2 O.sub.3 .multidot.2B.sub.2 O.sub.3 formed in the inorganic binding material can be obtained by firing the filter at 1,200.degree. C. to 1,300.degree. C.

摘要翻译： 用于过滤熔融铝的过滤器通过将100重量份的骨料颗粒与10至20重量份的无机粘合材料结合而获得，所述骨料颗粒由至少一种选自熔融氧化铝 和烧结氧化铝和所述无机粘合材料，其原料组合物包含25wt。 ％〜35重量％ SiO 2％，30〜40wt。 ％的B2O3，20〜35wt。 ％的Al2O3，余量为MgO。 根据本发明的过滤器具有10％至25％的结晶度，条件是在粉末X射线衍射中，结晶度以在2θ= 16.5°C处出现的9Al 2 O 3 x 2 B 2 O 3的峰高的百分比表示。 到2θ= 43.4°处出现的α-Al2O3的峰高。 在无机粘合材料中形成的9Al2O3x2B2O3的针状晶体不大于10μm。 在无机粘结材料中形成的9Al2O3x2B2O3的针晶可以通过在1200℃〜1300℃下烧成过滤器而得到。