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    Ceramic cutting tool formed from Si.sub.3 N.sub.4 --Y.sub.2 O.sub.3 --SiO.sub.2 and method of making
    3.
    发明授权
    Ceramic cutting tool formed from Si.sub.3 N.sub.4 --Y.sub.2 O.sub.3 --SiO.sub.2 and method of making 失效
    由Si3N4-Y2O3-SiO2形成的陶瓷切割工具及其制作方法

    公开(公告)号：US4434238A

    公开(公告)日：1984-02-28

    申请号：US321837

    申请日：1981-11-16

    申请人： Andre Ezis ,  Shyam K. Samanta ,  Krishnamoorthy Subramanian

    发明人： Andre Ezis ,  Shyam K. Samanta ,  Krishnamoorthy Subramanian

    IPC分类号： B23B27/14 ,  C04B35/593 ,  C04B35/58

    CPC分类号： B23B27/148 ,  C04B35/593

    摘要： A method is disclosed comprising placing in a hot pressing environment a controlled mixture of a first powder of Si.sub.3 N.sub.4 containing a controlled amount of SiO.sub.2 (with or without a limited amount of milling media) with a second powder consisting essentially of Y.sub.2 O.sub.3, hot pressing the controlled mixture, and cooling the resultant unitary object.A novel silicon nitride comprising a unitary object is disclosed which can be shaped to form a novel cutting tool useful for machining metal such as cast iron. The object has selected crystalline phases formed beta Si.sub.3 N.sub.4 and beta prime Si.sub.3 N.sub.4 and has intergranular crystalline secondary phases consisting essentially of YSiO.sub.2 N, Y.sub.10 Si.sub.17 N.sub.4 O.sub.23 and Y.sub.2 Si.sub.2 O.sub.7 with the YSiO.sub.2 N phase representing at least a 25% volume fraction of the secondary phases and comprising essentially all of the yittria-silicon oxide.

    摘要翻译： 公开了一种方法，包括在热压环境中放置受控量的含有受控量SiO 2的Si 3 N 4粉末（有或没有有限量的研磨介质）与基本上由Y 2 O 3组成的第二粉末的受控混合物， 混合，并冷却所得的单一物体。 公开了一种包括整体物体的新型氮化硅，其可被成形为形成用于机加工诸如铸铁的金属的新型切削工具。 目的是选择形成βSi 3 N 4和β原子Si 3 N 4的结晶相，并且具有基本上由YSiO 2 N，Y 10 Si 17 N 4 O 23和Y 2 SiO 2 7组成的晶间结晶二相，其中YSiO 2 N相代表次级相的至少25％的体积分数并且基本上包括所有的Yittria 氧化硅。

    Ceramic cutting tool formed from Si.sub.3 N.sub.4 -Y.sub.2 O.sub.3 -SiO.sub .
    5.
    发明授权
    Ceramic cutting tool formed from Si.sub.3 N.sub.4 -Y.sub.2 O.sub.3 -SiO.sub . 失效
    由Si3N4-Y2O3-SiO2形成的陶瓷切割工具及其制作方法

    公开(公告)号：US4401617A

    公开(公告)日：1983-08-30

    申请号：US232754

    申请日：1981-02-09

    申请人： Andre Ezis ,  Shyam K. Samanta ,  Krishnamoorthy Subramanian

    发明人： Andre Ezis ,  Shyam K. Samanta ,  Krishnamoorthy Subramanian

    IPC分类号： B23B27/14 ,  C04B35/593 ,  C04B35/58

    CPC分类号： C04B35/593 ,  B23B27/148

    摘要： A method is disclosed comprising placing in a hot pressing environment a controlled mixture of a first powder of Si.sub.3 N.sub.4 containing a controlled amount of SiO.sub.2 (with or without a limited amount of milling media) with a second powder consisting essentially of Y.sub.2 O.sub.3, hot pressing the controlled mixture, and cooling the resultant unitary object.A novel silicon nitride comprising a unitary object is disclosed which can be shaped to form a novel cutting tool useful for machining metal such as cast iron. The object has selected crystalline phases formed beta Si.sub.3 N.sub.4 and beta prime Si.sub.3 N.sub.4 and as intergranular crystalline secondary phases consisting essentially of YSiO.sub.2 N, y.sub.10 Si.sub.17 N.sub.4 O.sub.23 and Y.sub.2 Si.sub.2 O.sub.7 with the YSiO.sub.2 N phase representing at least a 25% volume fraction of the secondary phases and comprising essentially all of the yittria-silicon oxide.

    摘要翻译： 公开了一种方法，包括在热压环境中放置受控量的含有受控量SiO 2的Si 3 N 4粉末（有或没有有限量的研磨介质）与基本上由Y 2 O 3组成的第二粉末的受控混合物， 混合，并冷却所得的单一物体。 公开了一种包括整体物体的新型氮化硅，其可被成形为形成用于机加工诸如铸铁的金属的新型切削工具。 目的是选择结晶相形成的βSi 3 N 4和β原子Si 3 N 4以及基本上由YSiO 2 N，y 10 Si 17 N 4 O 23和Y 2 Si 2 O 7组成的晶间结晶二次相，其中YSiO 2 N相代表次级相的至少25体积分数，并且基本上包括所有的yittria 氧化硅。

    Bonded abrasive tools with combination of finely microcrystalline aluminous abrasive and a superabrasive
    9.
    发明授权
    Bonded abrasive tools with combination of finely microcrystalline aluminous abrasive and a superabrasive 失效
    结合研磨工具，结合精细微晶铝磨料和超级磨料

    公开(公告)号：US4944773A

    公开(公告)日：1990-07-31

    申请号：US243284

    申请日：1988-09-09

    申请人： Charles V. Rue ,  Leonard G. Pukaite ,  Krishnamoorthy Subramanian

    发明人： Charles V. Rue ,  Leonard G. Pukaite ,  Krishnamoorthy Subramanian

    IPC分类号： B24D3/00 ,  B24D3/34 ,  C09K3/14

    CPC分类号： B24D3/346 ,  B24D3/00 ,  C09K3/1418

    摘要： Bonded abrasive grinding tools with more cost effective grinding performance than those known in the prior art for grinding certain types of hard metals may be made by combining in the tool both grits of conventional superabrasives and grits of aluminous abrasive characterized by a microstructure that predominantly comprises tightly packed, very fine crystals of alpha alumina or of an aluminum spinel such as magnesium aluminate. The predominant crystallites in the best type of aluminous abrasive have maximum dimensions of no more than about 0.3 micron and generally show little or no regular faceting at about 5,000 magnification and are approximately equiaxed, with no higher aspect ratio than 2, usually less than 1.5.

    摘要翻译： 具有比现有技术已知的用于研磨某些类型的硬金属的具有更高成本效益的研磨性能的粘结研磨研磨工具可以通过在工具中组合两种常规超级磨料的磨粒和铝磨料砂粒来形成，其特征在于主要包含紧密的微结构 包装的，非常细的α氧化铝晶体或铝尖晶石如铝酸镁。 最佳类型的铝质研磨剂中的主要微晶具有不超过约0.3微米的最大尺寸，并且通常在约5000倍的倍数下显示很少或没有规则的刻面，并且近似等轴，而不具有比2更高的纵横比，通常小于1.5。