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    SiAlON composites and method of preparing the same
    4.
    发明授权
    SiAlON composites and method of preparing the same 失效
    SiAlON复合材料及其制备方法

    公开(公告)号：US5413972A

    公开(公告)日：1995-05-09

    申请号：US178377

    申请日：1993-12-23

    申请人： Chinmau J. Hwang ,  Donald R. Beaman ,  David W. Susnitzky

    发明人： Chinmau J. Hwang ,  Donald R. Beaman ,  David W. Susnitzky

    IPC分类号： C04B35/599 ,  C04B35/597 ,  C04B35/58

    CPC分类号： C04B35/597

    摘要： A dense, substantially glass free, SiAlON ceramic material and method of making such material. The material has at least an alpha-SiAlON phase and a beta-SiAlON phase and exhibits excellent high temperature oxidation resistance and strength, good room temperature toughness and hardness, and a density greater than at least 95 percent of theoretical. The method of making the ceramic material is simple and includes adding AlN in an amount sufficient to allow formation of a desired amount of alpha-SiAlON, and in addition, convert SiO.sub.2 and Al.sub.2 O.sub.3 into the beta-SiAlON phase, preferably, by adding AlN in an amount between about 1.3X+0.08Y-0.0045XY and about 1.3X+0.2Y-0.0024XY, wherein X is a weight percent of the SiO.sub.2 based on total weight of the Si.sub.3 N.sub.4 in the mixture and Y is a weight percent of alpha-SiAlON phase desired.

    摘要翻译： 密实的，基本上无玻璃的SiAlON陶瓷材料和制造这种材料的方法。 该材料至少具有α-SiAlON相和β-SiAlON相，并且具有优异的高温抗氧化性和强度，良好的室温韧性和硬度，并且密度大于理论值的至少95％。 制造陶瓷材料的方法是简单的，并且包括以足以形成所需量的α-SiAlON的量加入AlN，此外，将SiO 2和Al 2 O 3转化成β-SiAlON相，优选通过将AlN加入到 在约1.3X + 0.08Y-0.0045XY和约1.3X + 0.2Y-0.0024XY之间的量，其中X是基于混合物中Si 3 N 4的总重量的SiO 2的重量百分比，Y是α -SiAlON相需要。

    Self-reinforced silicon nitride ceramic of high fracture toughness and a method of preparing the same
    7.
    发明授权
    Self-reinforced silicon nitride ceramic of high fracture toughness and a method of preparing the same 失效
    具有高断裂韧性的自增强氮化硅陶瓷及其制备方法

    公开(公告)号：US5118645A

    公开(公告)日：1992-06-02

    申请号：US572823

    申请日：1990-08-24

    申请人： Aleksander J. Pyzik ,  Harold E. Rossow ,  Douglas B. Schwarz ,  Donald R. Beaman ,  Barbara M. Pyzik ,  William J. Dubensky

    发明人： Aleksander J. Pyzik ,  Harold E. Rossow ,  Douglas B. Schwarz ,  Donald R. Beaman ,  Barbara M. Pyzik ,  William J. Dubensky

    IPC分类号： B23P15/28 ,  C04B35/584 ,  C04B35/593 ,  C04B35/645 ,  C04B35/80

    CPC分类号： C04B35/645 ,  C04B35/593 ,  C04B35/806

    摘要： A process for preparing a self-reinforced silicon nitride ceramic body of high fracture toughness comprising hot-pressing a powdcer mixture containing silicon nitride, a densification aid such as sodium oxide, a conversion aid such as lanthanum oxide and a compound, such as gallium oxide, which enhances growth of .beta.-silicon nitride whiskers-under conditions such that densification and the in situ formation of .beta.-silicon nitride whiskers having a high aspect ratio occur. A novel silicon nitride ceramic of high fracture toughness and high fracture strength is disclosed comprising a .beta.-silicon nitride crystalline phase wherein at least about 20 volume percent of the phase is in the form of whiskers having an average aspect ratio of at least about 2.5; a glassy second phase containing the densification aid, the conversion aid, the compound which enhances growth of .beta.-silicon nitride whiskers, and an amount of silica; and not greater than about 10 weight percent of the total weight as other phases. The glassy phase may also include a minor amount, e.g., up to 5.0 weight percentg, based upon total weight of the ceramic, of aluminum nitride or boron nitride. The glassy phase optionally includes an amount of a secondary reinforcing material such as silicon carbide whiskers.

    摘要翻译： 一种制备高断裂韧性的自增强氮化硅陶瓷体的方法，包括热压含有氮化硅的粉末混合物，致密化助剂如氧化钠，转化助剂如氧化镧和化合物如氧化镓 ，其增强了β-硅氮化物晶须的生长 - 在使得具有高纵横比的β-硅氮化物晶须的致密化和原位形成的条件下。 公开了一种具有高断裂韧性和高断裂强度的新型氮化硅陶瓷，其包括β-氮化硅结晶相，其中该相的至少约20体积百分数为晶须的形式，其平均纵横比为至少约2.5; 含有致密化助剂的玻璃质第二相，转化助剂，增强β-硅氮化物晶须生长的化合物和一定量的二氧化硅; 并且不大于作为其它相的总重量的约10重量％。 玻璃相还可以包括少量，例如，至多5.0重量％，基于陶瓷的总重量，氮化铝或氮化硼。 玻璃相任选地包括一定量的第二增强材料，例如碳化硅晶须。

    Sialon composites and method of preparing the same
    8.
    发明授权
    Sialon composites and method of preparing the same 失效
    赛隆复合材料及其制备方法

    公开(公告)号：US5227346A

    公开(公告)日：1993-07-13

    申请号：US847522

    申请日：1992-03-06

    申请人： Chinmau J. Hwang ,  Donald R. Beaman

    发明人： Chinmau J. Hwang ,  Donald R. Beaman

    IPC分类号： C04B35/599 ,  C04B35/597

    CPC分类号： C04B35/597

    摘要： This invention is a multi-phase SiAlON composite having a first alpha-SiAlON phase prepared from a multi-cationic mixture including oxides and nitrides of strontium, at least one of yttrium or a rare earth metal, and at least one other metal such as Ca, Mg, Li or Na. The composite also has a second phase of beta-SiAlON, and a material of a third phase of intergranular amorphous morphology including Si, Al, O, and N combined with a mixture of strontium, at least one of Ca, Mg, Li or Na and at least one of yttrium or a rare earth element. The multi-phase SiAlON exhibits excellent strength, fracture toughness, hardness, creep resistance and oxidation resistance. The material is useful for high wear, high temperature machine or engine components and tools.

    摘要翻译： 本发明是一种多相SiAlON复合材料，其具有由多阳离子混合物制备的第一α-SiAlON相，该多阳离子混合物包括锶，钇或稀土金属中的至少一种和至少一种其它金属如Ca ，Mg，Li或Na。 所述复合材料还具有β-SiAlON的第二相，以及包括Si，Al，O和N的晶间无定形形态的第三相的材料，其与锶，Ca，Mg，Li或Na中的至少一种的混合物 以及钇或稀土元素中的至少一种。 多相SiAlON表现出优异的强度，断裂韧性，硬度，抗蠕变性和抗氧化性。 该材料适用于高磨损，高温机器或发动机部件和工具。

    Self-reinforced silicon nitride ceramic of high fracture toughness
    9.
    发明授权
    Self-reinforced silicon nitride ceramic of high fracture toughness 失效
    自增强氮化硅陶瓷具有高断裂韧性

    公开(公告)号：US5160508A

    公开(公告)日：1992-11-03

    申请号：US826315

    申请日：1992-01-24

    申请人： Aleksander J. Pyzik ,  Harold E. Rossow ,  Douglas B. Schwarz ,  Donald R. Beaman ,  Barbara M. Pyzik ,  William J. Dubensky

    发明人： Aleksander J. Pyzik ,  Harold E. Rossow ,  Douglas B. Schwarz ,  Donald R. Beaman ,  Barbara M. Pyzik ,  William J. Dubensky

    IPC分类号： C04B35/593 ,  C04B35/645 ,  C04B35/80

    CPC分类号： C04B35/593 ,  C04B35/645 ,  C04B35/806

    摘要： A process for preparing a self-reinforced silicon nitride ceramic body of high fracture toughness comprising hot-pressing a powder mixture containing silicon nitride, a densification aid such as sodium oxide, a conversion aid such as lanthanum oxide and a compound, such as gallium oxide, which enhances growth of .beta.-silicon nitride whiskers-under conditions such that densification and the in situ formation of .beta.-silicon nitride whiskers having a high aspect ratio occur. A novel silicon nitride ceramic of high fracture toughness and high fracture strength is disclosed comprising a .beta.-silicon nitride crystalline phase wherein at least about 20 volume percent of the phase is in the form of whiskers having an average aspect ratio of at least about 2.5; a glassy second phase containing the densificaton aid, the conversion aid, the compound which enhances growth of .beta.-silicon nitride whiskers, and an amount of silica; and not greater than about 10 weight percent of the total weight as other phases. The glassy phase may also include a minor amount, e.g., up to 5.0 weight percent, based upon total weight of the ceramic, of aluminum nitride or boron nitride. The glassy phase optionally includes an amount of a secondary reinforcing material such as silicon carbide whiskers.

    摘要翻译： 一种制备高断裂韧性的自增强氮化硅陶瓷体的方法，包括热压含有氮化硅的粉末混合物，致密化助剂例如氧化钠，转化助剂如氧化镧和化合物如氧化镓 ，其增强了β-硅氮化物晶须的生长 - 在使得具有高纵横比的β-硅氮化物晶须的致密化和原位形成的条件下。 公开了一种具有高断裂韧性和高断裂强度的新型氮化硅陶瓷，其包括β-氮化硅结晶相，其中该相的至少约20体积百分数为晶须的形式，其平均纵横比为至少约2.5; 含有致密助剂的玻璃质第二相，转化助剂，增强β-硅氮化物晶须生长的化合物和一定量的二氧化硅; 并且不大于作为其它相的总重量的约10重量％。 玻璃相还可以包括少量，例如，基于陶瓷的总重量，至多5.0重量％的氮化铝或氮化硼。 玻璃相任选地包括一定量的第二增强材料，例如碳化硅晶须。

    Method of preparing a self-reinforced silicon nitride ceramic of high fracture toughness
    10.
    发明授权
    Method of preparing a self-reinforced silicon nitride ceramic of high fracture toughness 失效
    制备高断裂韧性的自增强氮化硅陶瓷的方法

    公开(公告)号：US5021372A

    公开(公告)日：1991-06-04

    申请号：US398801

    申请日：1989-08-25

    申请人： Aleksander J. Pyzik ,  Douglas B. Schwarz ,  Harold E. Rossow ,  Donald R. Beaman ,  Barbara M. Pyzik ,  William J. Dubensky

    发明人： Aleksander J. Pyzik ,  Douglas B. Schwarz ,  Harold E. Rossow ,  Donald R. Beaman ,  Barbara M. Pyzik ,  William J. Dubensky

    IPC分类号： C04B35/593 ,  C04B35/645 ,  C04B35/80

    CPC分类号： C04B35/645 ,  C04B35/593 ,  C04B35/806

    摘要： A process for preparing a self-reinforced silicon nitride ceramic body of high fracture toughness comprising hot-pressing a powder mixture containing silicon nitride, a densification aid such as sodium oxide, a conversion aid such as lanthanum oxide and a compound, such as gallium oxide, which enhances growth of .beta.-silicon nitride whiskers-under conditions such that densification and the in situ formation of .beta.-silicon nitride whiskers having a high aspect ratio occur. A novel silicon nitride ceramic of high fracture toughness and high fracture strength is disclosed comprising a .beta.-silicon nitride crystalline phase wherein at least about 20 volume percent of the phase is in the form of whiskers having an average aspect ratio of at least about 2.5; a glassy second phase containing the densification aid, the conversion aid, the compound which enhances growth of .beta.-silicon nitride whiskers, and an amount of silica; and not greater than about 10 weight percent of the total weight as other phases. The glassy phase may also include a minor amount, e.g., up to 5.0 weight percent, based upon total weight of the ceramic, of aluminum nitride or boron nitride.

    摘要翻译： 一种制备高断裂韧性的自增强氮化硅陶瓷体的方法，包括热压含有氮化硅的粉末混合物，致密化助剂例如氧化钠，转化助剂如氧化镧和化合物如氧化镓 ，其增强了β-硅氮化物晶须的生长 - 在使得具有高纵横比的β-硅氮化物晶须的致密化和原位形成的条件下。 公开了一种具有高断裂韧性和高断裂强度的新型氮化硅陶瓷，其包括β-氮化硅结晶相，其中该相的至少约20体积百分数为晶须的形式，其平均纵横比为至少约2.5; 含有致密化助剂的玻璃质第二相，转化助剂，增强β-硅氮化物晶须生长的化合物和一定量的二氧化硅; 并且不大于作为其它相的总重量的约10重量％。 玻璃相还可以包括少量，例如，基于陶瓷的总重量，至多5.0重量％的氮化铝或氮化硼。