Patents by Inventor Wook Kyung Jang

Wook Kyung Jang 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).

  • Method of manufacturing pre-sintered Si-mixture granule for porous sintered reaction-bonded silicon nitride, porous pre-sintered granule manufactured by the method, and method of manufacturing porous sintered reaction-bonded silicon nitride
    Patent number: 8992808
    Abstract: The present invention relates to a method of manufacturing a porous pre-sintered granule for a sintered reaction-bonded silicon nitride, to which a pressure forming technology can be applied to obtain a porous sintered reaction-bonded silicon nitride having high porosity and having a structure in which macropores and micropores coexist with each other, and to a porous pre-sintered granule manufactured by the method. The method includes the steps of: granulating a raw material comprising silicon and sintering additives including yttrium, aluminum and at least one alkali earth metal compound; and pre-sintering the granulated raw material at a temperature of 1300˜1375° C. under an inert atmosphere. According to the present invention, a porous pre-sintered granule for porous sintered reaction-bonded silicon nitride, which can increase the air permeability and trapping efficiency by controlling the size of a pore channel such that macropores and micropores coexist, can be manufactured.
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: March 31, 2015
    Assignee: Korea Institute of Machinery & Materials
    Inventors: Young Jo Park, Wook Kyung Jang, In Hyuck Song
  • METHOD OF MANUFACTURING PRE-SINTERED SI-MIXTURE GRANULE FOR POROUS SINTERED REACTION-BONDED SILICON NITRIDE, POROUS PRE-SINTERED GRANULE MANUFACTURED BY THE METHOD, AND METHOD OF MANUFACTURING POROUS SINTERED REACTION-BONDED SILICON NITRIDE
    Publication number: 20120196125
    Abstract: The present invention relates to a method of manufacturing a porous pre-sintered granule for a sintered reaction-bonded silicon nitride, to which a pressure forming technology can be applied to obtain a porous sintered reaction-bonded silicon nitride having high porosity and having a structure in which macropores and micropores coexist with each other, and to a porous pre-sintered granule manufactured by the method. The method includes the steps of: granulating a raw material comprising silicon and sintering additives including yttrium, aluminum and at least one alkali earth metal compound; and pre-sintering the granulated raw material at a temperature of 1300˜1375° C. under an inert atmosphere. According to the present invention, a porous pre-sintered granule for porous sintered reaction-bonded silicon nitride, which can increase the air permeability and trapping efficiency by controlling the size of a pore channel such that macropores and micropores coexist, can be manufactured.
    Type: Application
    Filed: August 30, 2011
    Publication date: August 2, 2012
    Applicant: KOREA INSTITUTE OF MACHINERY & MATERIALS
    Inventors: Young Jo Park, Wook Kyung Jang, In Hyuck Song