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1.发明公开
公开(公告)号：EP0476068A4
公开(公告)日：1992-05-13
申请号：EP90912584
申请日：1990-05-17
申请人： KENNAMETAL INC.
IPC分类号： B23B27/14 , C04B35/10 , C04B35/111 , C04B35/56 , C04B35/80
CPC分类号： B23B27/145 , B23B2224/04 , B23B2224/28 , B23B2226/72 , B23B2228/61 , C04B35/111 , C04B35/803
摘要： A ceramic composition is provided having an alumina based matrix with silicon carbide whiskers and titanium carbide phase dispersed therein. The composition includes about 1.0 to less than 30 volume percent silicon carbide whiskers, about 5 to about 40 volume percent titanium carbide phase. The sum of the volume percents of silicon carbide whiskers and titanium carbide phase is less than about 60 volume percent. This composition is for use as a cutting. The cutting insert (10) has a rake face (30), a flank face (50) and a cutting edge (70) at the junction of the rake and flank faces.
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2.发明公开
公开(公告)号：EP0377654A4
公开(公告)日：1991-05-22
申请号：EP88908481
申请日：1988-08-08
申请人： KENNAMETAL INC.
IPC分类号： C04B35/64 , B22F3/14 , B22F3/15 , B23B27/14 , C04B35/10 , C04B35/56 , C04B35/58 , C04B35/645 , C04B35/80 , C04B35/81 , C04B41/50 , C04B41/52 , C04B41/87 , C04B41/89
CPC分类号： C04B41/009 , B23B27/148 , B23B2228/61 , C04B35/6455 , C04B35/80 , C04B41/5062 , C04B41/52 , C04B41/87 , C04B41/89 , C04B41/455 , C04B41/4578 , C04B41/53 , C04B41/5031 , C04B35/645
摘要： A method of manufacturing a shaped ceramic article by hot isostatic pressing comprising the following steps: (a) forming a compact of sinterable ceramic compositions, (b) applying a coating to the compact by vapor deposition of a ceramic composition that does not become vitreous before or during the subsequent isostatic pressing step, and (c) heating and isostatically pressing the coated compacts in an atmosphere that reacts with the coating and/or the compact at pressing temperatures and pressures to cause the compact to approach theoretical density. The method is suitable for forming a fired ceramic compact having a whisker loading in excess of about 12.5 volume percent with substantially isotropic properties due to a substantially random orientation of the whiskers.
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公开(公告)号：EP0441877A4
公开(公告)日：1992-02-26
申请号：EP89912858
申请日：1989-10-13
申请人： KENNAMETAL INC.
IPC分类号： B23B27/14 , B24D3/02 , B24D3/06 , C04B35/10 , C04B35/119 , C04B35/56 , C04B35/645 , C04B35/80
CPC分类号： C04B35/645 , B23B27/148 , B23B2228/61 , B24D3/02 , C04B35/119 , C04B35/803
摘要： An article of manufacture, preferably a metal-cutting insert (10), is provided with an alumina based ceramic composition composed of (in volume percent, v/o): about 1.5 to 37.5 silicon carbide whiskers; about 5 to 17.5 zirconia; residue of a magnesium oxide addition added in an amount effective to enhance the metal-cutting lifetime of the cutting edge (70) of the insert; and an alumina based matrix in which the silicon carbide whiskers, zirconia and residue of magnesium oxide are substantially homogeneously distributed. At least 2 v/o of the alumina based ceramic composition is tetragonal zirconia.
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公开(公告)号：EP0346399A4
公开(公告)日：1990-09-05
申请号：EP88904830
申请日：1988-05-03
申请人： KENNAMETAL INC.
IPC分类号： C04B35/56 , C04B35/58 , C04B35/597 , C04B35/78
CPC分类号： C04B35/597
摘要： A ceramic composite is provided possessing a combination of high fracture toughness, high hardness and high wear resistance. The composite contains SiC particles dispersed in a ceramic matrix of mainly sialon. The sialon is composed of at least 10 weight percent alpha prime sialon, with the remainder, if any, being essentially beta prime sialon. The figure provided is a photomicrograph illustrating a polished microstructure of a composite comprising SiC, alpha prime sialon and beta prime sialon.
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公开(公告)号：EP0330679A4
公开(公告)日：1990-09-05
申请号：EP88903651
申请日：1988-03-25
申请人： KENNAMETAL INC.
IPC分类号： B05D7/00 , C04B35/58 , C04B35/597 , C04B41/50 , C04B41/52 , C04B41/87 , C04B41/89 , C23C16/00 , C23C16/30
CPC分类号： C04B41/009 , C04B35/597 , C04B41/5067 , C04B41/52 , C04B41/87 , C04B41/89 , C23C16/308 , C04B41/0072 , C04B41/5025 , C04B35/58042
摘要： A sialon ceramic material comprising a ceramic core selected from alpha-prime-sialon, beta-prime-sialon, and an intergranular phase and, optionally, substantially inert refractory phases. The sialon ceramic material has an alloyed surface layer with a substantially increased aluminum and oxygen content.
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6.发明公开ALUMINA-ZIRCONIA-SILICON CARBIDE-MAGNESIA COMPOSITIONS AND CUTTING TOOLS 失效氧化锆 - 氧化锆 - 碳化硅 - 镁合金组合物和切割工具
公开(公告)号：EP0449844A4
公开(公告)日：1991-11-21
申请号：EP89912753
申请日：1989-10-13
申请人： KENNAMETAL INC.
IPC分类号： B23B27/14 , B23P15/28 , C04B35/10 , C04B35/119 , C04B35/645 , C04B35/80 , C09K3/14
CPC分类号： C04B35/119 , C04B35/645 , C04B35/803
摘要： A metal cutting insert is provided with an alumina based ceramic composition composed of (in volume percent, v/o): about 1.5 to 17.5 silicon carbide whiskers; about 5 to 17.5 zirconia; residue of a magnesium oxide addition added in an amount effective to enhance the metal cutting lifetime of the cutting edge of the insert; and an alumina based matrix in which the silicon carbide whiskers, zirconia and residue of magnesium oxide are substantially homogeneously distributed. At least 4 v/o of the alumina based ceramic composition is tetragonal zirconia. Figure 1 (10) is an isometric view of a square cutting insert having a rake face (30), a flank face (50), and a cutting edge (70) at the juncture of the rake and the flank faces in accordance with the present invention.
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公开(公告)号：EP0376975A4
公开(公告)日：1990-10-24
申请号：EP88907948
申请日：1988-08-08
申请人： KENNAMETAL INC.
IPC分类号： B23P15/28 , B23B27/14 , C04B35/10 , C04B35/111 , C04B35/80 , C04B41/50 , C04B41/52 , C04B41/87 , C04B41/89
CPC分类号： C04B41/009 , B23B27/148 , B23B2228/61 , C04B35/111 , C04B35/803 , C04B41/5031 , C04B41/52 , C04B41/87 , C04B41/89 , C04B41/5068 , C04B35/10 , C04B35/80
摘要： An article of manufacture is provided having a SiC whisker reinforced alumina matrix substrate which has an alumina coating bonded to its exterior surface. It has been found that these articles are useful as cutting inserts in the high speed rough machining of steels.
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