公开(公告)号：US20190177162A1

公开(公告)日：2019-06-13

申请号：US15839995

申请日：2017-12-13

Applicant: NATIONAL CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： CHUN-TE WU ,  KUAN-TING LAI ,  CHENG-HUNG SHIH ,  YANG-KUO KUO

IPC: C01B21/082

CPC classification number: C01B21/082 ,  C01B21/0828 ,  C01P2004/32

Abstract: A method utilizes easily obtained carbon as carbon source for sintering, followed by high energy ball milling process with planetary ball mill for high energy homogenous mixing of the carbon source, solvent and nano-level silicon dioxide powder, along with a high energy ball milling process repeatedly performed using different sized ball mill beads, so as to formulate a spray granulation slurry with the optimal viscosity, to complete the process of micronization of carbon source evenly encapsulated by silicon dioxide powders. The optimal ratio of C/SiO2 is 1-2.5 to produce a spherical silicon dioxide powder (40-50 μm) evenly encapsulated by the carbon source. The powder is then subjected to a high temperature (1450□) sintering process under nitrogen gas. Lastly, the sintered silicon nitride powder is subjected to homogenizing carbon removal process in a rotational high temperature furnace to complete the fabricating process.

公开(公告)号：US20230219855A1

公开(公告)日：2023-07-13

申请号：US17572652

申请日：2022-01-11

Applicant: NATIONAL CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： CHUN-TE WU ,  YANG-KUAO KUO

IPC: C04B35/486 ,  C04B35/634 ,  C04B35/622 ,  C04B35/626 ,  C04B35/624 ,  C04B35/64 ,  B33Y40/10 ,  B33Y40/20 ,  B28B1/00 ,  B28B11/24

CPC classification number: C04B35/486 ,  C04B35/63416 ,  C04B35/63488 ,  C04B35/62218 ,  C04B35/6264 ,  C04B35/624 ,  C04B35/64 ,  B33Y40/10 ,  B33Y40/20 ,  B28B1/001 ,  B28B11/243 ,  C04B2235/3246 ,  C04B2235/6026 ,  C04B2235/658 ,  C04B2235/6562 ,  C04B2235/6567 ,  B33Y10/00

Abstract: A method of preparation of a ceramic slurry for use in 3D printing includes steps of: (A) providing a plasticizer and a disperser and mixing the plasticizer and the disperser evenly; (B) mixing the mixture obtained in step (A) with an adhesive, wherein the adhesive is polyvinyl alcohol; and (C) adding a Yttria-stabilized zirconia powder to the mixture obtained in step (B) to produce, by sufficient blending and deaerating, the ceramic slurry for use in 3D printing. A method of preparation of a ceramic product includes steps of: (A) preparing a ceramic slurry with the method; (B) performing 3D printing with the ceramic slurry to form a primary green body; (C) placing the primary green body in a freezer to undergo a refrigeration process, thereby causing crystallization of polyvinyl alcohol; and (D) thawing the frozen primary green body to form a plastic green body with gel structure.