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    CUBIC BORON NITRIDE INSERTS, RELATED METHODS, AND RELATED APPARATUS
    3.
    发明申请
    CUBIC BORON NITRIDE INSERTS, RELATED METHODS, AND RELATED APPARATUS 有权

    公开(公告)号：US20220080511A1

    公开(公告)日：2022-03-17

    申请号：US17476653

    申请日：2021-09-16

    Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

    Inventor： Patrick Kwon

    IPC: B23B27/14 ,  C04B35/5831

    Abstract: The disclosure relates to cubic boron nitride inserts for machining iron-based workpieces, as well as related methods and apparatuses. The insert includes a cutting element containing cubic boron nitride (cBN) in an amount in a range of 50 wt. % to 95 wt. % based on the cutting element, and a binder containing at least one of (i) alumina (Al2O3) and a manganese material (e.g., an oxide such as MnOx) and (ii) zirconia (ZrO2). The insert can be used for various machining processes, for example turning or boring. Suitable workpieces include iron-based materials or ferrous alloys, for example a cast iron such as compacted graphite iron (CGI).

    MICROCHEMICAL SYSTEM APPARATUS AND RELATED METHODS OF FABRICATION
    4.
    发明申请
    MICROCHEMICAL SYSTEM APPARATUS AND RELATED METHODS OF FABRICATION 有权

    公开(公告)号：US20210178387A1

    公开(公告)日：2021-06-17

    申请号：US17184509

    申请日：2021-02-24

    Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

    Inventor： Patrick Kwon ,  Junghoon Yeom

    IPC: B01L3/00 ,  C04B35/65 ,  C04B35/01 ,  B01J19/00 ,  B81C99/00 ,  B32B18/00 ,  B01J8/00 ,  B01J8/34 ,  B01J19/02

    Abstract: The disclosure relates to microchemical (or microfluidic) apparatus as well as related methods for making the same. The methods generally include partial sintering of sintering powder (e.g., binderless or otherwise free-flowing sintering powder) that encloses a fugitive phase material having a shape corresponding to a desired cavity structure in the formed apparatus. Partial sintering removes the fugitive phase and produces a porous compact, which can then be machined if desired and then further fully sintered to form the final apparatus. The process can produce apparatus with small, controllable cavities shaped as desired for various microchemical or microfluidic unit operations, with a generally smooth interior cavity finish, and with materials (e.g., ceramics) able to withstand harsh environments for such unit operations.

    METHODS FOR FABRICATING METAL ARTICLES BY ADDITIVE MANUFACTURING
    5.
    发明申请
    METHODS FOR FABRICATING METAL ARTICLES BY ADDITIVE MANUFACTURING 有权

    公开(公告)号：US20250128329A1

    公开(公告)日：2025-04-24

    申请号：US18918724

    申请日：2024-10-17

    Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

    Inventor： Haseung Chung ,  Patrick Kwon

    IPC: B22F10/64 ,  B22F10/12 ,  B33Y10/00 ,  B33Y40/20

    Abstract: The disclosure relates to additive manufacturing processes generally including forming a green part, pre-sintering or debinding the green part, and fully sintering the part. The green part generally includes a solid polymer matrix or layers with metal particles therein. A debinding or pre-sintering process can include a controlled-temperature and/or controlled-heating rate debinding step to decompose the polymer binder and simultaneously the pre-sinter the metal particles in the desired shape. A sintering process can include a two-step heating process at different temperatures to provide high-density components without shape deformation. Debinding and sintering can be performed in a co-debinding/co-sintering process to form a single pre-sintered part, which then can be fully sintered to provide a final part with a complex geometry. The resulting parts exhibit better dimensional stability, higher-density, and are defect and carbide free.

    Cubic boron nitride inserts, related methods, and related apparatus
    6.
    发明授权
    Cubic boron nitride inserts, related methods, and related apparatus 有权

    公开(公告)号：US12194546B2

    公开(公告)日：2025-01-14

    申请号：US17476653

    申请日：2021-09-16

    Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

    Inventor： Patrick Kwon

    IPC: B23B1/00 ,  B23B27/14 ,  B23B27/20 ,  B23B35/00 ,  C04B35/5831

    Abstract: The disclosure relates to cubic boron nitride inserts for machining iron-based workpieces, as well as related methods and apparatuses. The insert includes a cutting element containing cubic boron nitride (cBN) in an amount in a range of 50 wt. % to 95 wt. % based on the cutting element, and a binder containing at least one of (i) alumina (Al2O3) and a manganese material (e.g., an oxide such as MnOx) and (ii) zirconia (ZrO2). The insert can be used for various machining processes, for example turning or boring. Suitable workpieces include iron-based materials or ferrous alloys, for example a cast iron such as compacted graphite iron (CGI).

    Methods for fabricating metal articles by additive manufacturing
    7.
    发明授权
    Methods for fabricating metal articles by additive manufacturing 有权

    公开(公告)号：US12168256B2

    公开(公告)日：2024-12-17

    申请号：US17726733

    申请日：2022-04-22

    Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

    Inventor： Haseung Chung ,  Patrick Kwon

    IPC: B22F10/12 ,  B22F10/73 ,  B29C64/165 ,  B29C64/314 ,  B29C64/357 ,  B29K505/00 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y40/10

    Abstract: The disclosure relates to a method for forming a metal article by additive manufacturing and related apparatus for performing the method. A metal particle suspension including a UV-curable polymeric resin liquid medium, and metal particles distributed throughout the liquid medium is deposited and cured by spatially selective exposure to UV radiation in a layer-by-layer process. Metal particle size can be selected in combination with the applied layer thickness to ensure complete cure throughout the applied layer while providing a high print speed and high spatial resolution. Intermittent or periodic partial curing of an applied layer can be used to maintain a homogeneous distribution of metal particles in the applied layer prior to full curing. The final product is achieved after sintering, which removes the cured binder in a debinding step and also provides the desired final article at close to the full density.

    Methods for Fabricating Metal Articles by Additive Manufacturing
    9.
    发明申请
    Methods for Fabricating Metal Articles by Additive Manufacturing 有权

    公开(公告)号：US20220339704A1

    公开(公告)日：2022-10-27

    申请号：US17726733

    申请日：2022-04-22

    Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

    Inventor： Haseung Chung ,  Patrick Kwon

    IPC: B22F10/12 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y40/10 ,  B29C64/165 ,  B29C64/314 ,  B29C64/357 ,  B22F10/73

    Abstract: The disclosure relates to a method for forming a metal article by additive manufacturing and related apparatus for performing the method. A metal particle suspension including a UV-curable polymeric resin liquid medium, and metal particles distributed throughout the liquid medium is deposited and cured by spatially selective exposure to UV radiation in a layer-by-layer process. Metal particle size can be selected in combination with the applied layer thickness to ensure complete cure throughout the applied layer while providing a high print speed and high spatial resolution. Intermittent or periodic partial curing of an applied layer can be used to maintain a homogeneous distribution of metal particles in the applied layer prior to full curing. The final product is achieved after sintering, which removes the cured binder in a debinding step and also provides the desired final article at close to the full density.

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