Patents by Inventor Mark S. Greenfield

Mark S. Greenfield has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8409734
    Abstract: Coated substrates having high wear resistant coatings are disclosed. The coatings include at least one layer of either titanium oxycarbonitride or titanium aluminum oxycarbonitride, such that the layer has an oxygen to titanium atomic percent ratio in the range of about 0.01 to about 0.09 and an aluminum to titanium atomic percent ratio in the range of about 0 to about 0.1. The coatings have a hardness to Young's modulus ratio of at least 0.06. The substrate may be a cutting insert. Methods of making such coated substrates are also disclosed in which layers comprising titanium oxycarbonitride or titanium aluminum oxycarbonitride are deposited by medium temperature chemical vapor deposition (MT-CVD) on substrates in the temperature range of about 750 to about 950° C. using a mixture of gases wherein the ratio of the hydrogen gas to the nitrogen gas is greater than 5.
    Type: Grant
    Filed: March 4, 2011
    Date of Patent: April 2, 2013
    Assignee: Kennametal Inc.
    Inventors: Zhigang Ban, Yixong Liu, Mark S. Greenfield
  • Patent number: 8409695
    Abstract: A wear resistant multilayer nitride hard coating for substrates. The hard coating includes a first layer of titanium aluminum nitride and a second layer comprising a plurality of sublayer groups. Each sublayer group includes a first sublayer of titanium silicon nitride and a second sublayer of titanium aluminum nitride. The composition of the titanium aluminum nitride, both in the first layer and in the sublayer groups, is (TixAl1-x)N, wherein 0.4?x?0.6. The composition of the titanium silicon nitride sublayers is (TiySi1-y)N, wherein 0.85?y?0.98, and all of the silicon is in solid solution in the titanium silicon nitride such that no silicon phase or silicon nitride phase exists in this sublayer. The combined amount of aluminum and silicon present in the sublayer groups being narrowly controlled such that the sum of x and y is in the range of 1.38 to 1.46.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: April 2, 2013
    Assignee: Kennametal Inc.
    Inventors: Wangyang Ni, Yixiong Liu, Mark S. Greenfield, Ronald M. Penich
  • Publication number: 20120237794
    Abstract: A coated article such as a coated cutting tool or coated wear part, which includes a substrate and a coating scheme on the substrate. The coating scheme has a titanium-containing coating layer, and an aluminum oxynitride coating layer on the titanium-containing coating layer. The aluminum oxynitride includes a mixture of phases having a hexagonal aluminum nitride type structure (space group: P63mc), a cubic aluminum nitride type structure (space group: Fm-3m), and optionally amorphous structure. The aluminum oxynitride coating layer has a composition of aluminum in an amount between about 20 atomic percent and about 50 atomic percent, nitrogen in an amount between about 40 atomic percent and about 70 atomic percent, and oxygen in an amount between about 1 atomic percent and about 20 atomic percent.
    Type: Application
    Filed: March 15, 2011
    Publication date: September 20, 2012
    Applicant: Kennametal Inc.
    Inventors: Volkmar Sottke, Hartmut Westphal, Hendrikus Van Den Berg, Zhigang Ban, Yixiong Liu, Mark S. Greenfield
  • Publication number: 20120225285
    Abstract: Coated substrates having high wear resistant coatings are disclosed. The coatings include at least one layer of either titanium oxycarbonitride or titanium aluminum oxycarbonitride, such that the layer has an oxygen to titanium atomic percent ratio in the range of about 0.01 to about 0.09 and an aluminum to titanium atomic percent ratio in the range of about 0 to about 0.1. The coatings have a hardness to Young's modulus ratio of at least 0.06. The substrate may be a cutting insert. Methods of making such coated substrates are also disclosed in which layers comprising titanium oxycarbonitride or titanium aluminum oxycarbonitride are deposited by medium temperature chemical vapor deposition (MT-CVD) on substrates in the temperature range of about 750 to about 950° C. using a mixture of gases wherein the ratio of the hydrogen gas to the nitrogen gas is greater than 5.
    Type: Application
    Filed: March 4, 2011
    Publication date: September 6, 2012
    Applicant: KENNAMETAL INC.
    Inventors: Zhigang Ban, Yixiong Liu, Mark S. Greenfield
  • Patent number: 8080323
    Abstract: A coated cutting insert for use in a chip-forming material removal operation wherein the coated cutting insert includes a substrate that has a flank surface and a rake surface and the flank surface intersects the rake surface to form a cutting edge at the intersection. There is a wear-resistant coating scheme that adheres to at least a portion of the substrate. The wear-resistant coating scheme includes one or more coating layers of one or more of alumina, hafnia and zirconia. There is a wear indicating coating that adheres to at least a portion of the wear-resistant coating scheme. The wear indicating coating includes M(OxCyNz) wherein M is selected from the group comprising one or more of the following titanium, hafnium, zirconium, chromium, titanium-aluminum alloy, hafnium-aluminum alloy, zirconium-aluminum alloy, chromium-aluminum alloy, and their alloys, and x>0, y?0, z?0 and y+z>0.
    Type: Grant
    Filed: March 28, 2008
    Date of Patent: December 20, 2011
    Assignee: Kennametal Inc.
    Inventors: Zhigang Ban, Mark J. Rowe, Yixiong Liu, Alfred S. Gates, Jr., Kent P. Mizgalski, Mark S. Greenfield
  • Publication number: 20110293909
    Abstract: A wear resistant multilayer nitride hard coating for substrates. The hard coating includes a first layer of titanium aluminum nitride and a second layer comprising a plurality of sublayer groups. Each sublayer group includes a first sublayer of titanium silicon nitride and a second sublayer of titanium aluminum nitride. The composition of the titanium aluminum nitride, both in the first layer and in the sublayer groups, is (TixAl1-x)N, wherein 0.4?x?0.6. The composition of the titanium silicon nitride sublayers is (TiySi1-y)N, wherein 0.85?y?0.98, and all of the silicon is in solid solution in the titanium silicon nitride such that no silicon phase or silicon nitride phase exists in this sublayer. The combined amount of aluminum and silicon present in the sublayer groups being narrowly controlled such that the sum of x and y is in the range of 1.38 to 1.46.
    Type: Application
    Filed: May 28, 2010
    Publication date: December 1, 2011
    Applicant: KENNAMETAL, INC.
    Inventors: Wangyang Ni, Yixiong Liu, Mark S. Greenfield, Ronald M. Penich
  • Publication number: 20090004440
    Abstract: A coated cutting insert for use in a chip-forming material removal operation wherein the coated cutting insert includes a substrate that has a flank surface and a rake surface and the flank surface intersects the rake surface to form a cutting edge at the intersection. There is a wear-resistant coating scheme that adheres to at least a portion of the substrate. The wear-resistant coating scheme includes one or more coating layers of one or more of alumina, hafnia and zirconia. There is a wear indicating coating that adheres to at least a portion of the wear-resistant coating scheme. The wear indicating coating includes M(OxCyNz) wherein M is selected from the group comprising one or more of the following titanium, hafnium, zirconium, chromium, titanium-aluminum alloy, hafnium-aluminum alloy, zirconium-aluminum alloy, chromium-aluminum alloy, and their alloys, and x>0, y?0, z?0 and y+z>0.
    Type: Application
    Filed: March 28, 2008
    Publication date: January 1, 2009
    Inventors: Zhigang Ban, Mark J. Rowe, Yixiong Liu, Alfred S. Gates, JR., Kent P. Mizgalski, Mark S. Greenfield
  • Publication number: 20080014421
    Abstract: A coated cutting tool for chipforming machining of materials, as well as a method for making the same, wherein the coated cutting tool includes a substrate. The substrate has a rake surface and a flank surface wherein there is a cutting edge at the intersection of the rake surface and the flank surface. There is a coating scheme on at least a portion of one of the rake surface or the flank surface of the substrate. The coating scheme includes a top oxide interference film that visually appears to be colored when viewed under white lighting formed by full or partial anodization of an anodizable layer.
    Type: Application
    Filed: July 13, 2006
    Publication date: January 17, 2008
    Inventors: Aharon Inspektor, Mark S. Greenfield, Kent P. Mizgalski, Joseph M. Tauber
  • Patent number: 6998173
    Abstract: A coated cemented carbide tool, and a method for making the same, wherein the as-sintered substrate is formed by sintering in an atmosphere having at least a partial pressure and for a part of the time a nitrogen partial pressure.
    Type: Grant
    Filed: November 13, 2002
    Date of Patent: February 14, 2006
    Assignee: Kennametal Inc.
    Inventors: Yixiong Liu, Donald A. Botbyl, George P. Grab, Mark S. Greenfield
  • Patent number: 6866921
    Abstract: A coated cemented (binder alloy, e.g., cobalt-chromium alloy) tungsten carbide cutting insert that comprises a substrate and a coating. The substrate contains at least about 70 weight percent tungsten and carbon, between about 3 weight percent and about 12 weight percent cobalt, and at least 0.09 weight percent chromium. The substrate presents a surface zone of binder alloy enrichment that begins near (or at) and extends inwardly from a peripheral surface of the substrate. The coating includes a base layer that contains chromium.
    Type: Grant
    Filed: March 7, 2003
    Date of Patent: March 15, 2005
    Assignee: Kennametal Inc.
    Inventors: George P. Grab, Mark S. Greenfield, Anakkavur T. Santhanam
  • Patent number: 6638474
    Abstract: A coated cemented carbide tool, and a method for making the same, wherein the as-sintered substrate is formed by sintering in an atmosphere having at least a partial pressure and for a part of the time a nitrogen partial pressure.
    Type: Grant
    Filed: March 19, 2001
    Date of Patent: October 28, 2003
    Assignee: Kennametal Inc.
    Inventors: Yixiong Liu, Donald A. Botbyl, George P. Grab, Mark S. Greenfield
  • Publication number: 20030161695
    Abstract: A coated cemented (binder alloy, e.g., cobalt-chromium alloy) tungsten carbide cutting insert that comprises a substrate and a coating. The substrate contains at least about 70 weight percent tungsten and carbon, between about 3 weight percent and about 12 weight percent cobalt, and at least 0.09 weight percent chromium. The substrate presents a surface zone of binder alloy enrichment that begins near (or at) and extends inwardly from a peripheral surface of the substrate. The coating includes a base layer that contains chromium.
    Type: Application
    Filed: March 7, 2003
    Publication date: August 28, 2003
    Inventors: George P. Grab, Mark S. Greenfield, Anakkavur T. Santhanam
  • Publication number: 20030126945
    Abstract: A coated cemented carbide tool, and a method for making the same, wherein the as-sintered substrate is formed by sintering in an atmosphere having at least a partial pressure and for a part of the time a nitrogen partial pressure.
    Type: Application
    Filed: November 13, 2002
    Publication date: July 10, 2003
    Inventors: Yixiong Liu, Donald A. Botbyl, George P. Grab, Mark S. Greenfield
  • Patent number: 6554548
    Abstract: A coated cemented (binder alloy, e.g., cobalt-chromium alloy) tungsten carbide cutting insert that comprises a substrate and a coating. The substrate contains at least about 70 weight percent tungsten and carbon, between about 3 weight percent and about 12 weight percent cobalt, and at least 0.09 weight percent chromium. The substrate presents a surface zone of binder alloy enrichment that begins near (or at) and extends inwardly from a peripheral surface of the substrate. The coating includes a base layer that contains chromium.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: April 29, 2003
    Assignee: Kennametal Inc.
    Inventors: George P. Grab, Mark S. Greenfield, Anakkavur T. Santhanam
  • Publication number: 20010041107
    Abstract: A coated cemented carbide tool, and a method for making the same, wherein the as-sintered substrate is formed by sintering in an atmosphere having at least a partial pressure and for a part of the time a nitrogen partial pressure.
    Type: Application
    Filed: March 19, 2001
    Publication date: November 15, 2001
    Applicant: Kennametal Inc.,
    Inventors: Yixiong Liu, Donald A. Botbyl, George P. Grab, Mark S. Greenfield
  • Patent number: 6183687
    Abstract: A method of heat treating a sintered body having an exposed surface which has the steps of: providing a sintered body comprised of a hard carbide and a binder, the binder being present in the sintered body at a first binder level and the hard carbide in the sintered body being of a first grain size; placing granules of a sacrificial sintered material in contact with at least one portion of the exposed surface of the sintered body, the sacrificial sintered material comprised of the hard carbide and the binder, the binder being present in the sacrificial sintered material at a second binder level and the hard carbide in the sacrificial sintered material being of a second grain size; and heat treating the sintered body and sacrificial sintered material so as to change the binder content in a surface region of the sintered body.
    Type: Grant
    Filed: August 11, 1995
    Date of Patent: February 6, 2001
    Assignee: Kennametal Inc.
    Inventor: Mark S. Greenfield
  • Patent number: 5623723
    Abstract: A method of heat treating a green compact having an exposed surface. The method includes the steps of: providing a green compact comprised of a hard carbide and binder; placing a powder of grain refiner on at least one portion of the exposed surface of the green compact; and heat treating the green compact and grain refiner powder so as to diffuse the grain refiner toward the center of the green compact thereby forming a peripheral zone inwardly from the exposed surface in which the grain refiner was placed, and forming an interior zone. The peripheral zone having a grain size that is smaller than the grain size of the bulk zone.
    Type: Grant
    Filed: August 11, 1995
    Date of Patent: April 22, 1997
    Inventor: Mark S. Greenfield
  • Patent number: 5112411
    Abstract: A mining and construction bit body is composed of a Mn-B steel alloy composition. The alloy content of the composition in percents by weight includes: carbon, 0.33-0.38; manganese, 1.10-1.35; boron, 0.0005 minimum; silicon 0.15-0.30; sulfur, 0.045 maximum; and phosphorus, 0.035 maximum. The composition has a minimum hardenability of 47 Rockwell C at the Jominy 6/16 position and a maximum as-rolled hardness of 22 Rockwell C such that without anneal the composition meets hardenability and machinability requirements that make it useful for fabricating mining and construction bit bodies of all sizes.
    Type: Grant
    Filed: November 29, 1990
    Date of Patent: May 12, 1992
    Assignee: Kennametal Inc.
    Inventor: Mark S. Greenfield
  • Patent number: 5008073
    Abstract: A mining and construction bit body is composed of a Mn-B steel alloy composition. The alloy content of the composition in percents by weight includes: carbon, 0.33-0.38; manganese, 1.10-1.35; boron, 0.0005 minimum; silicon 0.15-0.30; sulfur, 0.045 maximum; and phosphorus, 0.035 maximum. The composition has a minimum hardenability of 47 Rockwell C at the Jominy 6/16 position and a maximum as-rolled hardness of 22 Rockwell C such that without anneal the composition meets hardenability and machinability requirements that make it useful for fabricating mining and construction bit bodies of all sizes.
    Type: Grant
    Filed: September 8, 1989
    Date of Patent: April 16, 1991
    Assignee: Kennametal Inc.
    Inventor: Mark S. Greenfield
  • Patent number: 4886710
    Abstract: A mining and construction bit body is composed of a Mn-B steel alloy composition. The alloy content of the composition in percents by weight includes: carbon, 0.33-0.38; manganese, 1.10-1.35; boron, 0.0005 minimum; silicon 0.15-0.30; sulfur, 0.045 maximum; and phosphorus, 0.035 maximum. The composition has a minimum hardenability of 47 Rockwell C at the Jominy 6/16 position and a maximum as-rolled hardness of 22 Rockwell C such that without anneal the composition meets hardenability and machinability requirements that make it useful for fabricating mining and construction bit bodies of all sizes.
    Type: Grant
    Filed: April 16, 1987
    Date of Patent: December 12, 1989
    Assignee: Kennametal Inc.
    Inventor: Mark S. Greenfield