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公开(公告)号：US20220275485A1
公开(公告)日：2022-09-01
申请号：US17625694
申请日：2020-07-08
发明人： Mirjam LILJA , Ida BORGH , Ioannis ARVANITIDIS , Leif AKESSON , Xueying HAI , Susanne NORGREN
摘要： The present disclosure relates to a method of making a cemented carbide mining insert, a cemented carbide mining insert with having a chemical and hardness gradient and to the use thereof. The method includes the steps of providing a green mining insert compact formed from a first powder including a WC-based hard phase, optionally one or more further hard-phase components and a binder, applying a second powder including a grain refiner compound and/or a carbon based grain growth promoter to at least one portion of a surface of the green mining insert compac, and sintering the green mining insert compact to produce a cemented carbide mining insert, wherein the first powder additionally includes Cr, in an amount such that the mass ratio of Cr/binder is of 0.01-0.3.
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公开(公告)号：US20230036990A1
公开(公告)日：2023-02-02
申请号：US17785482
申请日：2020-12-18
摘要： A method of treating a sintered mining insert including cemented carbide includes the step of subjecting the mining insert to a surface hardening process. The surface hardening process is executed at an elevated temperature of or above 100° C. A mining insert is also provided, wherein the HV1 Vickers hardness measurement increase (HV1%) from the surface region, measured as an average of HV1 measurements taken at 100 μm, 200 μm and 300 μm below the surface, compared to the HV1 Vickers hardness measured in the bulk (HV1bulk), is at least 8.05-0.00350×HV1bulk.
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公开(公告)号：US20230184110A1
公开(公告)日：2023-06-15
申请号：US17924394
申请日：2021-05-12
IPC分类号： E21C35/183 , C22C1/051 , C22C29/08 , C22C29/06
CPC分类号： E21C35/1835 , C22C1/051 , C22C29/08 , C22C29/067
摘要： A method of redistributing the binder phase of a cemented carbide mining insert having a WC hard-phase component, optionally one or more further hard-phase components and a binder includes the steps of providing a green cemented carbide mining insert; applying at least one binder puller selected from a metal oxide or a metal carbonate to only at least one local area of the surface of the green cemented carbide insert; sintering the green carbide mining insert to form a sintered cemented carbide insert; and subjecting the sintered cemented carbide insert to dry tumbling process executed at an elevated temperature of or above 100° C., preferably at a temperature of or above 200° C., more preferably at a temperature of between 200° C. and 450° C.
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公开(公告)号：US20210140019A1
公开(公告)日：2021-05-13
申请号：US17041014
申请日：2019-03-22
发明人： Mirjam LILJA , Jose Maria TARRAGO CIFRE , Ida BORGH , Malin MARTENSSON , Ioannis ARVANITIDIS , Krystof TURBA
摘要： A rock drill insert made of cemented carbide includes hard constituents of tungsten carbide (WC) in a binder phase of Ni—Cr, or Ni—Co—Cr, and a balance of WC and unavoidable impurities. The cemented carbide has a 3.5-18 wt % binder phase. The binder phase has >0 wt % Ni. The mass ratio Cr/(Ni+Co) is 0.02-0.19. A difference between the hardness at 0.3 mm depth at some point of the surface of the rock drill insert and the minimum hardness of the bulk of the rock drill insert is at least 30 HV3.
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公开(公告)号：US20220001445A1
公开(公告)日：2022-01-06
申请号：US17293572
申请日：2019-11-06
发明人： Mirjam LILJA , Ioannis ARVANITIDIS
摘要： A method of redistributing the binder phase of a cemented carbide mining insert having one or more hard-phase components and a binder includes the steps of: a) providing a green cemented carbide mining insert; b) applying at least one binder puller selected from a metal oxide or a metal carbonate to the surface of the green cemented carbide mining insert; and c) sintering the green cemented carbide mining insert, the metal oxide or metal carbonate being only applied to at least one local area on the surface of the green cemented carbide mining insert. Moreover, a cemented carbide having a hardness gradient and the use thereof is also provided.
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