Patents by Inventor Iakovos Sigalas
Iakovos Sigalas 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).
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Patent number: 10040724Abstract: The present invention provides for carbide ceramic matrix composite comprising Cf/C—SiC-xMC wherein Cf/C is a carbon fiber reinforced carbon matrix, x is at least 2, and wherein MC are carbides of transition metals with M being at least two different transition metals selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten. The invention further provides for a method for manufacturing the composite.Type: GrantFiled: December 9, 2016Date of Patent: August 7, 2018Assignees: University of the Witwatersrand, Johannesburg, Fraunhofer-Gesellschaft zur Forderung der Angewandten Forschung E.V.Inventors: Phylis Sarah Makurunje, Iakovos Sigalas, Mathias Herrmann
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Publication number: 20170166486Abstract: The present invention provides for carbide ceramic matrix composite comprising Cf/C—SiC-xMC wherein Cf/C is a carbon fibre reinforced carbon matrix, x is at least 2, and wherein MC are carbides of transition metals with M being at least two different transition metals selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten. The invention further provides for a method for manufacturing the composite.Type: ApplicationFiled: December 9, 2016Publication date: June 15, 2017Inventors: Phylis Sarah Makurunje, Iakovos Sigalas, Mathias Herrmann
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Publication number: 20140007515Abstract: The invention relates to an abrasive compact comprising a mass of diamond particles and a silicon containing binder phase wherein the diamond particles are present in an amount less than 75 volume % and the binder phase contains less than 2 volume % unreacted (elemental) silicon. The invention further relates to a method of producing an abrasive compact including the steps of forming a feed diamond powder into a diamond preform, interposing a separating mechanism between the diamond preform and a silicon infiltrant source, heating the diamond preform and silicon infiltrant source until the infiltrant is molten and the preform and infiltrant are isothermal and allowing infiltration from the molten silicon infiltrant source to occur into the diamond preform.Type: ApplicationFiled: September 12, 2013Publication date: January 9, 2014Applicant: Element Six Abrasives S.A.Inventors: Iakovos SIGALAS, Kekeletso MLUNGWANE, Mathias HERRMANN
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Patent number: 8562702Abstract: The invention relates to an abrasive compact comprising a mass of diamond particles and a silicon containing binder phase wherein the diamond particles are present in an amount less than 75 volume % and the binder phase contains less than 2 volume % unreacted (elemental) silicon. The invention further relates to a method of producing an abrasive compact including the steps of forming a feed diamond powder into a diamond preform, interposing a separating mechanism between the diamond preform and a silicon infiltrant source, heating the diamond preform and silicon infiltrant source until the infiltrant is molten and the preform and infiltrant are isothermal and allowing infiltration from the molten silicon infiltrant source to occur into the diamond preform.Type: GrantFiled: July 23, 2008Date of Patent: October 22, 2013Assignee: Element Six Abrasives S.A.Inventors: Iakovos Sigalas, Kekeletso Mlungwane, Mathias Herrmann
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Patent number: 8426330Abstract: The invention provides a boron suboxide composite material comprising boron suboxide and a secondary phase, wherein the secondary phase contains a rare earth metal oxide. The rare earth metal oxide may be selected from the oxides of scandium, yttrium, which is preferred, and elements of the lanthanide series, and may be a mixture of rare earth metal oxides. The secondary phase may also include, in addition to the rare earth metal oxide(s), a further oxide or mixture of oxides of an element of the Groups IA, MA, MIA, and IVA of the periodic table. Moreover, the secondary phase may also contain a boride, and particularly a boride selected from the borides of transition metals of the fourth to eighth groups of the periodic table.Type: GrantFiled: April 24, 2008Date of Patent: April 23, 2013Inventors: Anthony Andrews, Iakovos Sigalas, Mathias Herrmann
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Patent number: 8426043Abstract: The invention provides a boron suboxide composite material comprising boron suboxide and a secondary phase, wherein the secondary phase contains a boride. The boride may be selected from the borides of transition metals of the fourth to eighth groups of the periodic table. Particularly, the boride may be selected from the borides of iron, cobalt, nickel, titanium, tungsten, hafnium, tantalum, zirconium, rhenium, molybdenum or chromium. The boride also may be a platinum group metal boride, preferably palladium boride. The secondary phase also may contain one or more oxides.Type: GrantFiled: April 24, 2008Date of Patent: April 23, 2013Inventors: Anthony Andrews, David Stuart McLachlan, Iakovos Sigalas, Mathias Herrmann
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Patent number: 8197780Abstract: A method of producing a boron suboxide composite material having improved fracture toughness.Type: GrantFiled: May 4, 2011Date of Patent: June 12, 2012Assignee: Element Six (Production) (Pty) Ltd.Inventors: Geoffrey John Davies, Iakovos Sigalas, Mathias Herrmann, Thembinkosi Shabalala
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Publication number: 20110203187Abstract: A boron suboxide composite material having improved fracture toughness consists of particulate or granular boron suboxide distributed in a binder phase, such as AlxByOz, for example.Type: ApplicationFiled: May 4, 2011Publication date: August 25, 2011Inventors: Geoffrey John Davies, Iakovos Sigalas, Mathias Herrmann, Thembinkosi Shabalala
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Patent number: 7955579Abstract: A boron suboxide composite material having improved fracture toughness consists of particulate or granular boron suboxide distributed in a binder phrase, such as AlxByOz, for example.Type: GrantFiled: September 6, 2006Date of Patent: June 7, 2011Assignee: Element Six (Production) (Pty) Ltd.Inventors: Geoffrey John Davies, Iakovos Sigalas, Mathias Herrmann, Thembinkosi Shabalala
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Publication number: 20100308256Abstract: The invention provides a boron suboxide composite material comprising boron suboxide and a secondary phase, wherein the secondary phase contains a rare earth metal oxide. The rare earth metal oxide may be selected from the oxides of scandium, yttrium, which is preferred, and elements of the lanthanide series, and may be a mixture of rare earth metal oxides. The secondary phase may also include, in addition to the rare earth metal oxide(s), a further oxide or mixture of oxides of an element of the Groups IA, MA, MIA, and IVA of the periodic table. Moreover, the secondary phase may also contain a boride, and particularly a boride selected from the borides of transition metals of the fourth to eighth groups of the periodic table.Type: ApplicationFiled: April 24, 2008Publication date: December 9, 2010Inventors: Anthony Andrews, Iakovos Sigalas, Mathias Herrmann
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Publication number: 20100307067Abstract: The invention relates to an abrasive compact comprising a mass of diamond particles and a silicon containing binder phase wherein the diamond particles are present in an amount less than 75 volume % and the binder phase contains less than 2 volume % unreacted (elemental) silicon. The invention further relates to a method of producing an abrasive compact including the steps of forming a feed diamond powder into a diamond preform, interposing a separating mechanism between the diamond preform and a silicon infiltrant source, heating the diamond preform and silicon infiltrant source until the infiltrant is molten and the preform and infiltrant are isothermal and allowing infiltration from the molten silicon infiltrant source to occur into the diamond preform.Type: ApplicationFiled: July 23, 2008Publication date: December 9, 2010Inventors: Iakovos Sigalas, Kekeletso Mlungwane, Mathias Herrmann
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Publication number: 20100300004Abstract: The invention provides a boron suboxide composite material comprising boron suboxide and a secondary phase, wherein the secondary phase contains a boride. The boride may be selected from the borides of transition metals of the fourth to eighth groups of the periodic table. Particularly, the boride may be selected from the borides of iron, cobalt, nickel, titanium, tungsten, hafnium, tantalum, zirconium, rhenium, molybdenum or chromium. The boride also may be a platinum group metal boride, preferably palladium boride. The secondary phase also may contain one or more oxides.Type: ApplicationFiled: April 24, 2008Publication date: December 2, 2010Inventors: Anthony Andrews, David Stuart McLachlan, Iakovos Sigalas, Mathias Herrmann
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Publication number: 20100304138Abstract: The invention provides a boron suboxide composite material comprising boron suboxide and a secondary phase, wherein the secondary phase contains a mixture of at least two metal oxides, neither of which is a boron-containing oxide. At least one of the oxides may be selected from oxides of elements of Groups IA, IIA, IIIA, and IVA of the periodic table. Also, at least one of the oxides may be a rare earth metal oxide selected from the oxides of scandium, yttrium, and elements of the ianthanide series. The secondary phase of the composite material may also contain a boride, and particularly a boride selected from the borides of transition metals of the fourth to eighth groups of the periodic table.Type: ApplicationFiled: April 24, 2008Publication date: December 2, 2010Inventors: Anthony Andrews, Iakovos Sigalas, Mathias Herrmann
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Patent number: 7794821Abstract: A composite material consists of a plurality of cores dispersed in a matrix. The cores are formed of ultra-hard material, or the components for making an ultra-hard material. The matrix is formed of the components for making an ultra-hard material of a grade different to that of the cores, and a suitable binder. The ultra-hard material is polycrystalline in nature and is typically PCD or PcBN. The cores are typically provided as granules coated with the components for making an ultra-hard material and the binder. The composite material typically takes on a honeycomb structure of an ultra-hard material and cores within the pores of the honeycomb structure bonded to the honeycomb structure. The pores of the honeycomb structure may be ordered or random.Type: GrantFiled: June 11, 2004Date of Patent: September 14, 2010Inventors: Iakovos Sigalas, Mosimanegape Stephen Masete
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Publication number: 20090000208Abstract: A composite material comprises a plurality of cores of material selected from the group comprising carbides, nitrides, carbonitrides, cemented carbides, cemented nitrides, cemented carbonitrides and mixtures thereof, dispersed in a matrix. The matrix comprises the components for making an ultra-hard material, such as diamond or cBN abrasive particles, and a suitable binder. The ultra-hard material is polycrystalline in nature and is typically PCD or PcBN. The cores are typically provided as individual particles or in the form of granules. The granules may be further coated with a second coating, which may be a similar material to that of the cores or of an ultra-hard material of a different grade to that of the first coating. The composite material typically takes on a honeycomb structure of a hard material and cores within the pores of the honeycomb structure bonded to the honeycomb structure. The pores of the honeycomb structure may be ordered or random.Type: ApplicationFiled: September 8, 2008Publication date: January 1, 2009Inventors: Iakovos Sigalas, Geoffrey John Davies, Mosimanegape Stephen Masete, Raymond Albert Chapman
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Publication number: 20080317654Abstract: A boron suboxide composite material having improved fracture toughness consists of particulate or granular boron suboxide distributed in a binder phrase, such as AlxByOz, for example.Type: ApplicationFiled: September 6, 2006Publication date: December 25, 2008Inventors: Geoffrey John Davies, Iakovos Sigalas, Mathias Herrmann, Thembinkosi Shabalala
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Publication number: 20070175103Abstract: A method of producing a tool component comprising a working portion of bonded abrasive particles including a non-homogeneous region. The method includes the step of providing at least two sources of a material comprising abrasive particles in a suitable binder, the materials of the sources differing from each other. The material of one source may comprise diamond or cubic boron nitride particles, whilst the material of the other source may comprise carbide particles. Alternatively, the materials of the two sources may contain the same abrasive particle, such as diamond or cubic boron nitride particles, but in different particle sizes. The materials are delivered to a zone where mixing occurs, and the mixture is applied to a surface to produce a layer of the mixed materials on the surface, typically by spraying. By controlling the quantity of material from each source which is delivered to the mixing zone, different mixtures of the two abrasives can be created. In this way, layers, e.g.Type: ApplicationFiled: May 20, 2004Publication date: August 2, 2007Inventors: Iakovos Sigalas, Robert Fries
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Publication number: 20070054101Abstract: A composite material consists of a plurality of cores dispersed in a matrix. The cores are formed of ultra-hard material, or the components for making an ultra-hard material. The matrix is formed of the components for making an ultra-hard material of a grade different to that of the cores, and a suitable binder. The ultra-hard material is polycrystalline in nature and is typically PCD or PcBN. The cores are typically provided as granules coated with the components for making an ultra-hard material and the binder. The composite material typically takes on a honeycomb structure of an ultra-hard material and cores within the pores of the honeycomb structure bonded to the honeycomb structure. The pores of the honeycomb structure may be ordered or random.Type: ApplicationFiled: June 11, 2004Publication date: March 8, 2007Inventors: Iakovos Sigalas, Mosimanegape Masete
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Patent number: 7104160Abstract: A method for producing a cutting tool such a twist grill, end mill, or the like. The method provides an unbonded assembly including a cylindrical core having ends and an elongate side surface covered partially or completely by a coherent, unsintered layer including ultra-hard abrasive particles for producing an ultra-hard material. The unbonded assembly is subjected to elevated temperature and pressure conditions at which the ultra-hard abrasive is crystographically stable. The sintered product is then recovered that includes a cylindrical core and a layer of ultra-hard abrasive material bonded to the core, and the sintered product is worked to produce one or more cutting edges in the layer of ultra-hard abrasive material.Type: GrantFiled: December 18, 2001Date of Patent: September 12, 2006Inventors: Robert Fries, Iakovos Sigalas
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Publication number: 20060107602Abstract: A composite material comprises a plurality of cores of material selected from the group comprising carbides, nitrides, carbonitrides, cemented carbides, cemented nitrides, cemented carbonitrides and mixtures thereof, dispersed in a matrix. The matrix comprises the components for making an ultra-hard material, such as diamond or cBN abrasive particles, and a suitable binder. The ultra-hard material is polycrystalline in nature and is typically PCD or PcBN. The cores are typically provided as individual particles or in the form of granules. The granules may be further coated with a second coating, which may be a similar material to that of the cores or of an ultra-hard material of a different grade to that of the first coating. The composite material typically takes on a honeycomb structure of a hard material and cores within the pores of the honeycomb structure bonded to the honeycomb structure. The pores of the honeycomb structure may be ordered or random.Type: ApplicationFiled: October 29, 2003Publication date: May 25, 2006Inventors: Iakovos Sigalas, Geoffrey Davies, Mosimanegape Masete, Raymond Chapman