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    • 1. 发明授权
    • Process for forming 312 phase materials and process for sintering the same
    • 形成312相材料的工艺及其烧结工艺
    • US06461989B1
    • 2002-10-08
    • US09469893
    • 1999-12-22
    • Tamer El-RaghyMichel W. BarsoumMats SundbergHans Pettersson
    • Tamer El-RaghyMichel W. BarsoumMats SundbergHans Pettersson
    • C04B3556
    • C04B35/5615C04B35/56C04B35/573C04B35/58C04B35/5805C04B35/6365C04B35/64
    • A process is provided for forming a material comprising an M3X1Z2 phase comprising the steps of: (a) providing a mixture of (i) at least one transition metal species, (ii) at least one co-metal species selected from the group consisting of aluminum species, germanium species and silicon species, and (iii) at least one non-metal species selected from the group consisting of boron species, carbon species and nitrogen species; (b) heating said mixture to a temperature of about 1000° C. to about 1800° C., in an atmosphere within a substantially enclosed heating zone, for a time sufficient to form said M3X1Z2 phase; wherein the atmosphere has an O2 partial pressure of no greater than about 1×10−6 atm. The process provides a substantially single phase material comprising very little MZx-phase. A process for preparing a dense, substantially single-phase M3X1Z2 phase workpiece includes providing a highly-pure M3X1Z2-phase powder pre-form and sintering said pre-form at a temperature of about 1000° C. to about 1800° C., in an atmosphere within a substantially enclosed heating zone, for a time sufficient to form a dense, substantially single-phase, M3X1Z2-phase workpiece; wherein the atmosphere has an O2 partial pressure of no greater than about 1×10−6 atm.
    • 提供了一种用于形成包含M3X1Z2相的材料的方法,包括以下步骤:(a)提供(i)至少一种过渡金属物质,(ii)至少一种选自以下的共金属物质的混合物: 铝物种,锗物质和硅物质,和(iii)至少一种选自硼物质,碳物质和氮物质的非金属物质; (b)在基本封闭的加热区内的气氛中将所述混合物加热到约1000℃至约1800℃的温度,持续足以形成所述M3X1Z2相的时间; 其中气氛的O 2分压不大于约1×10 -6 atm。 该方法提供了包含很少的MZx相的基本单相材料。 制备致密的,基本上单相的M3X1Z2相工件的方法包括提供高纯度的M3X1Z2相粉末预成型体,并在约1000℃至约1800℃的温度下烧结所述预成型体, 在基本封闭的加热区内的气氛足以形成致密的,基本上单相的M3X1Z2相工件的时间; 其中气氛的O 2分压不大于约1×10 -6 atm。
    • 3. 发明授权
    • Silicon carbide articles reinforced with short graphite fibers
    • 用短石墨纤维增强的碳化硅制品
    • US06231791B1
    • 2001-05-15
    • US09291962
    • 1999-04-15
    • Michael HeineUdo Gruber
    • Michael HeineUdo Gruber
    • C04B3556
    • F16D69/023C04B35/573C04B35/806F16D2200/0047
    • A composite material article reinforced with high strength short graphite fibers and having a matrix substantially consisting of silicon carbide is prepared which has an elongation at break of 0.25 to 0.5% and thus exhibits quasi-ductile failure behavior. The short reinforcing graphite fibers are enclosed by at least two shells of graphitized carbon which have been obtained by impregnation with carbonizable impregnating agents and subsequent carbonization. The shell closest to the graphite fibers contains no cracks. The outermost shell is partially converted into silicon carbide. The starting material used comprises long or short fiber prepregs, which are first carbonized, then subjected at least once to an operation consisting of impregnation with a carbonizable impregnating agent and recarbonization, then graphitized at a temperature of up to a maximum of 2400° C. and then comminuted to yield a dry material for the production of a precursor article. This dry material is then mixed with a binder having a high carbon content and the mixture is compression molded to yield a green article. The green molding is then carbonized and afterwards infiltrated with liquid silicon, with the carbon matrix of the carbonized precursor article being converted into silicon carbide.
    • 制备用高强度短石墨纤维增强并具有基本上由碳化硅组成的基体的复合材料制品,其具有0.25至0.5%的断裂伸长率,因此显示出准韧性破坏行为。 短的增强石墨纤维被至少两个石墨化碳壳包围,这些石墨化碳通过用可碳化浸渍剂浸渍并随后进行碳化而获得。 最靠近石墨纤维的壳体不含裂纹。 最外壳被部分转化为碳化硅。 使用的起始原料包括长纤维或短纤维预浸料,其首先被碳化,然后至少进行一次操作,其中包括用可碳化浸渍剂的浸渍和再碳化,然后在最高达2400℃的温度下石墨化。 然后粉碎以产生用于制备前体制品的干燥材料。 然后将该干燥材料与具有高碳含量的粘合剂混合,并将该混合物压塑以产生绿色制品。 然后将绿色模制品碳化,然后用液态硅渗透,碳化前体制品的碳基体转化为碳化硅。
    • 5. 发明授权
    • Ceramic cutting tool
    • 陶瓷切割工具
    • US06248681B1
    • 2001-06-19
    • US09220752
    • 1998-12-28
    • Hideki Kato
    • Hideki Kato
    • C04B3556
    • C04B35/645B23B27/148C04B35/5611C04B35/5626C04B35/58021C04B35/6455
    • Disclosed is a ceramic cutting tool comprising in its essential part a ceramic material comprising, in one aspect, a titanium carbonitride-based hard phase and an alumina-based phase, wherein the ceramic material satisfies the following relationships: 10 wt %≦weight of Al2O3≦45 wt %; 51 wt %≦weight of TiCN≦89.5 wt %; and 96 wt %≦weight of Al2O3+weight of TiCN≦99.5 wt % wherein the weight of Al2O3 indicates the weight content of aluminum as calculated in terms of Al2O3; and the weight of TiCN indicates the weight content of said titanium carbonitride hard phase,with the proviso that the weight of TiCN is defined by the weight of Ti+ the weight of C+ the weight of N, in which weight of Ti, C, and N are the weight contents of the titanium component, carbon component, and nitrogen component, respectively.
    • 公开了一种陶瓷切削工具,其主要部分包括陶瓷材料,其一方面包括基于碳氮化钛的硬质相和氧化铝基相,其中所述陶瓷材料满足以下关系:其中Al 2 O 3的重量表示 以Al2O3计算的铝的重量含量; TiCN的重量表示碳氮化钛硬质合金的重量含量,条件是TiCN的重量由Ti +的重量定义,C +的重量为N的重量,其中Ti,C和N的重量 分别为钛成分,碳成分和氮成分的重量含量。
    • 6. 发明授权
    • Polymer precursor composition, crosslinked polymers, thermosets and ceramics made with silyl and siloxyl substituted carboranes with unsaturated organic end groups
    • 聚合物前体组合物,交联聚合物,热固性材料和由具有不饱和有机端基的甲硅烷基和甲硅烷基取代的碳硼烷制成的陶瓷
    • US06225247B1
    • 2001-05-01
    • US09336728
    • 1999-06-21
    • Teddy M. KellerEric J. Houser
    • Teddy M. KellerEric J. Houser
    • C04B3556
    • C08L83/14C08G77/56
    • A precursor composition includes (1) at least one crosslinking compound represented by the formula: wherein: u and x are independently selected positive integers, v and w are independently selected integers greater than or equal to zero, R1, R2, R3, R4, R5, R6, R7 and R8 are independently selected from the group consisting of alkyl, aryl, alkylaryl, haloalkyl, haloaryl and mixtures thereof; A and E are independently selected from the group consisting of O, an aliphatic bridge, an aryl bridge and mixtures thereof; and R9 and R10 are unsubstituted or substituted vinyl or ethynyl groups, (2) at least one organosilicon compound containing at least two silicon hydride moieties per molecule, and (3) a hydrosilation catalyst, A cross-linked polymer is formed by reacting the crosslinking compound of formula I with the organosilicon compound via a hydrosilation reaction. A thermoset polymer is formed by thermally curing the crosslinked polymer. A boron-carbon-silicon ceramic formed by pyrolyzing the cross-linked polymer.
    • 前体组合物包括(1)至少一种由下式表示的交联化合物:其中:u和x独立选择正整数,v和w独立地选自大于或等于零的整数,R 1,R 2,R 3,R 4, R5,R6,R7和R8独立地选自烷基,芳基,烷基芳基,卤代烷基,卤代芳基及其混合物; A和E独立地选自O,脂族桥,芳基桥及其混合物; 并且R 9和R 10是未取代的或取代的乙烯基或乙炔基,(2)每分子含有至少两个氢化硅部分的至少一种有机硅化合物,和(3)硅氢化催化剂。交联聚合物通过使交联 式I化合物与有机硅化合物通过硅氢化反应。 通过热固化交联聚合物形成热固性聚合物。 通过热解交联聚合物形成的硼 - 碳 - 硅陶瓷。
    • 7. 发明授权
    • Cemented carbide insert for turning, milling and drilling
    • 用于车削,铣削和钻孔的硬质合金刀片
    • US06221479B1
    • 2001-04-24
    • US09214923
    • 1999-04-20
    • Mats WaldenströmÅke ÖstlundOve Alm
    • Mats WaldenströmÅke ÖstlundOve Alm
    • C04B3556
    • C23C30/005B22F1/0003B22F1/0081B22F2998/00C22C1/051C22C29/08Y10T428/25Y10T428/252B22F9/026
    • There is disclosed a cemented carbide insert with excellent properties for machining of steels and stainless steels. The cemented carbide comprises WC and 4-25 wt-% Co. The WC-grains have an average grain size in the range 0.2-3.5 &mgr;m and a narrow grain size distribution in the range 0-4.5 &mgr;m. According to the method of the invention a cemented carbide cutting tool insert is made by mixing powders of WC, TiC, TaC and/or NbC, binder metal and pressing agent, drying preferably by spray drying, pressing to inserts and sintering. The method characterised in that a deagglomerated WC-powder with a narrow grain size distribution is used, that the powders of TiC, TaC and/or NbC are deagglomerated and that the mixing is wet mixing with no change in grain size or grain size distribution.
    • 公开了一种用于钢和不锈钢加工的优异性能的硬质合金刀片。 硬质合金包括WC和4-25wt%的Co。WC-晶粒的平均晶粒尺寸在0.2-3.5μm的范围内,并且窄的粒度分布在0-4.5μm的范围内。根据 通过混合WC,TiC,TaC和/或NbC,粘合剂金属和压制剂的粉末,优选通过喷雾干燥,压制成型和烧结来制备硬质合金刀具刀片。 该方法的特征在于使用具有窄粒度分布的解团聚WC粉末,其中TiC,TaC和/或NbC的粉末被解团聚,并且混合是湿混合而不改变晶粒尺寸或晶粒尺寸分布。