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| Electrophotographic lithographic printing plate precursor |
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| What is claimed is: 1. A flame-retarded non-drip polyurethane composition comprising: (a) a ... |
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| OF THE INVENTION The adhesive composition of the present invention contains two components which ... |
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| The present invention is a polymeric material which, when utilized in adhesive compositions, ... |
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| Blends of polyolefin graft polymers and ASA polymers |
| OF THE INVENTION AND THE PREFERRED EMBODIMENTS THEREOF Proportions of the ASA polymer in a binary ... |
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Reaction sintered boride-oxide-silicon nitride for ceramic cutting tools
| Details |
Inventors: DeAngelis, Thomas P.;
Assignee: Corning Incorporated (Corning, NY)
Primary Examiner: Bell; Mark L.
Assistant Examiner:
Attorney, Agent or Firm: Janes, Jr.; Clinton S., Wardell; Richard N., Buckwalter, Jr.; Charles Q.
This invention is directed to the production of oxide-boride-silicon nitride ceramics consisting essentially of ceramic bodies of oxide and boride phases which have silicon nitride added to improve the properties of the ceramic body for use as wear material, durable interface material, and cutting tool inserts. The addition of Si.sub.3 N.sub.4 to the oxide-boride body provides a durable ceramic material which provides a range of cutting speeds that may be utilized in both turning and milling operations. |
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DETAILED DESCRIPTION I claim: 1.
A ceramic composition consisting essentially of a dense homogeneous sintered body whose composition is selected from: (a) composition A consisting essentially of a dense homogeneous sintered body consisting on a mole percent basis, of 2 to 53% silicon nitride, where some or all of the silicon nitride is present as a separate phase or in solid solution with aluminum oxide as silicon-aluminum-oxynitride, and about 10 to 61% boride phase or phases of one or both of the elements Ti and Zr, and 37 to 88% oxide phase or phases of one or more of the elements of groups 3a, 4a, 3b, including lanthanide and actinide series elements, 4b, 5b, 6b and 8 of the periodic chart; and mixtures of any of the foregoing, or (b) composition B consisting essentially of a dense homogeneous sintered body consisting, on a mole percent basis, of 5 to 48% silicon nitride, where some or all of the silicon nitride is present as a separate phase or in solid solution with aluminum oxide as silicon-aluminum-oxynitride, and about 37 to 80% boride phase or phases of one or both of the elements Ti and Zr, and 15 to 25% oxide phase or phases of one or more of the elements of groups 3a, 4a, 3b, including lanthanide and actinide series elements, 5b, 6b, and 8 of the periodic table; and mixtures of the foregoing.
2.
The composition as defined in claim 1 wherein the selected composition is composition A.
3.
The composition as defined in claim 1 wherein the selected composition is composition B.
4.
The composition as defined in claim 2 containing about 5 to 53% silicon nitride.
5.
The composition as defined in claim 2 containing about 5 to 50% silicon nitride.
6.
The composition as defined in claim 2 containing about 5 to 40% silicon nitride.
7.
The composition as defined in claim 2 containing about 10 to 61% titanium diboride.
8.
The composition as defined in claim 2 containing about 10 to 55% titanium diboride.
9.
The composition as defined in claim 2 containing about 12 to 35% titanium diboride
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