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    Sintered self-reinforced silicon nitride
    1.
    发明授权
    Sintered self-reinforced silicon nitride 失效
    烧结自增强氮化硅

    公开(公告)号：US5312785A

    公开(公告)日：1994-05-17

    申请号：US63587

    申请日：1993-05-18

    申请人： Aleksander J. Pyzik ,  Harold E. Rossow

    发明人： Aleksander J. Pyzik ,  Harold E. Rossow

    IPC分类号： C04B35/81 ,  C04B35/584 ,  C04B35/593 ,  C04B35/80 ,  C04B35/58

    CPC分类号： C04B35/806 ,  C04B35/584 ,  C04B35/5935

    摘要： A dense, self-reinforced silicon nitride ceramic body and a method of making such body. The body has a composition that includes: (a) silicon nitride; (b) a glassy grain boundary phase containing oxygen, nitrogen, magnesium, yttrium, silicon, zirconium, and at least one of titanium and aluminum; and (c) a second crystalline phase containing zirconium oxide; and (d) crystalline phases of metal zirconium silicide and/or metal zirconium silicon nitride. The ceramic exhibits high fracture toughness and high fracture strength and has a density at least 98 percent of theoretical.

    摘要翻译： 一种致密的自增强氮化硅陶瓷体及其制造方法。 身体的组成包括：（a）氮化硅; （b）含有氧，氮，镁，钇，硅，锆和钛和铝中的至少一种的玻璃态晶界相; 和（c）含有氧化锆的第二结晶相; 和（d）金属硅化锆和/或金属氮化硅锆的结晶相。 该陶瓷具有高断裂韧性和高断裂强度，其密度至少为理论值的98％。

    Self-reinforced silicon nitride ceramic of high fracture toughness and a method of preparing the same
    2.
    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。

    Self-reinforced silicon nitride ceramic of high fracture toughness
    5.
    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
    6.
    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。