Patents by Inventor Chang-Dong Yim

Chang-Dong Yim 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).

  • Patent number: 10947609
    Abstract: The present invention is to provide a magnesium alloy comprising 0.001 parts by weight to 1.0 parts by weight of scandium and the balance of magnesium and unavoidable impurities, based on 100 parts by weight of a magnesium alloy, wherein the magnesium alloy has increased Fe solubility and reduced corrosion while providing excellent mechanical properties and corrosion resistance, and a method for producing the same. The magnesium alloy of the present invention can improve the corrosion resistance of the magnesium alloy by using scandium which can simultaneously prevent from microgalvanic corrosion between a substrate and impurities without deteriorating mechanical properties and improve the passivation property of the coating formed on the surface.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: March 16, 2021
    Assignee: KOREA INSTITUTE OF MATERIALS SCIENCE
    Inventors: Chang-Dong YiM, Bong-Sun You, Ha-Sik Kim, Young-Min Kim, Byoung-Gi Moon, Jun-Ho Bae
  • Publication number: 20190010582
    Abstract: The present invention is to provide a magnesium alloy comprising 0.001 parts by weight to 1.0 parts by weight of scandium and the balance of magnesium and unavoidable impurities, based on 100 parts by weight of a magnesium alloy, wherein the magnesium alloy has increased Fe solubility and reduced corrosion while providing excellent mechanical properties and corrosion resistance, and a method for producing the same. The magnesium alloy of the present invention can improve the corrosion resistance of the magnesium alloy by using scandium which can simultaneously prevent from microgalvanic corrosion between a substrate and impurities without deteriorating mechanical properties and improve the passivation property of the coating formed on the surface.
    Type: Application
    Filed: November 30, 2016
    Publication date: January 10, 2019
    Inventors: Chang-Dong YIM, Bong-Sun YOU, Ha-Sik KIM, Young-Min KIM, Byoung-Gi MOON, Jun-Ho BAE
  • Patent number: 10047426
    Abstract: Disclosed are a magnesium (Mg) alloy and a manufacturing method thereof. The Mg alloy has a composition including, by weight, 4% to 10% of Sn, 0.05% to 1.0% of Ca, 0.1% to 2% of at least one element selected from the group including Y and Er, the balance of Mg, and the other unavoidable impurities. The Mg alloy includes an Mg2Sn phase having excellent thermal stability, and is capable of being heat treated at a temperature of 480° C. or more.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: August 14, 2018
    Assignee: KOREA INSTITUTE OF MACHINERY & MATERIALS
    Inventors: Young Min Kim, Ha Sik Kim, Bong Sun You, Chang Dong Yim, Sung Hyuk Park
  • Patent number: 9822432
    Abstract: A magnesium alloy that forms a stable protective film on the surface of molten metal, having excellent ignition resistance restricting natural ignition of a chip thereof as well as having excellent strength and ductility, so that the Mg alloy can be melted and cast in the air or a common inert atmosphere. The magnesium alloy includes, by weight, 7.0% or greater but less than 11% of Al, 0.05% to 2.0% of Ca, 0.05% to 2.0% of Y, greater than 0% but not greater than 6.0% of Zn, and the balance of Mg, and the other unavoidable impurities. The total content of the Ca and the Y is equal to or greater than 0.1% but less than 2.5% of the total weight of the magnesium alloy.
    Type: Grant
    Filed: October 4, 2011
    Date of Patent: November 21, 2017
    Assignee: KOREA INSTITUTE OF MACHINERY & MATERIALS
    Inventors: Young Min Kim, Ha Sik Kim, Bong Sun You, Chang Dong Yim
  • Publication number: 20150315690
    Abstract: Provided are a method of preparing a magnesium alloy extrudate and a magnesium alloy extrudate prepared thereby. Specifically, the present invention is related to a method of preparing a magnesium alloy extrudate including melting a magnesium alloy raw material (step 1), casting the magnesium alloy raw material melted in step 1 to prepare a magnesium alloy billet (step 2), homogenizing the magnesium alloy billet prepared in step 2 (step 3), applying 3% to 20% of compressive deformation to the homogenized magnesium alloy billet of step 3 (step 4), and extruding the compressive deformed magnesium alloy billet of step 4 (step 5), and a magnesium alloy extrudate prepared thereby.
    Type: Application
    Filed: May 14, 2015
    Publication date: November 5, 2015
    Applicant: KOREA INSTITUTE OF MACHINERY AND MATERIALS
    Inventors: Sung Hyuk PARK, Bong Sun YOU, Ha-Sik KIM, Byoung-Gi MOON, Jun Ho BAE, Young Min KIM, Chang Dong YIM
  • Publication number: 20140348696
    Abstract: A method for increasing formability of magnesium alloy sheet and the magnesium alloy sheet prepared by the same are provided, in which the method includes the following steps: forming {10-12} twins in magnesium alloy sheet (step 1); and annealing the magnesium alloy sheet of step 1 (step 2). The present invention also provides the magnesium alloy sheet containing {10-12} twins prepared by the method. Accordingly, the room temperature formability and the warm formability are increased by forming {10-12} twins through deformation on the magnesium alloy sheet and subsequently performing annealing, because it is possible to artificially form {10-12} twins without increasing dislocations in the magnesium alloy sheet and accommodate the deformation generated during the forming via annihilation of the twins.
    Type: Application
    Filed: August 11, 2014
    Publication date: November 27, 2014
    Applicant: Korea Institute of Machinery and Materials
    Inventors: Sung Hyuk Park, Young Min Kim, Ha Sik Kim, Chang Dong Yim, Bong Sun You, Seong Gu Hong, Chong Soo Lee, Jeong Hun Lee, Hyung Lae Kim
  • Publication number: 20140332121
    Abstract: A magnesium alloy having high ductility and high toughness, and a preparation method thereof are provided, in which the magnesium alloy includes 1.0-3.5 wt % of tin, 0.05-3.0 wt % of zinc, and the balance of magnesium and inevitable impurities, and a preparation method thereof. Magnesium alloy with a relatively small tin content is added with zinc, and optionally, with one or more alloy elements selected from aluminum, manganese and rare earth metal, at a predetermined content ratio. As a result, the alloy exhibits superior ductility and moderate strength due to the suppression of excessive formation of precipitates and some precipitates hardening effect, respectively. Accordingly, compared to extruded material prepared from conventional commercial magnesium alloys, higher ductility and toughness are provided, so that the alloy can be widely applied over the entire industries including automotive and aerospace industries.
    Type: Application
    Filed: July 25, 2014
    Publication date: November 13, 2014
    Applicant: KOREA INSTITUTE OF MACHINERY AND MATERIALS
    Inventors: Sung Hyuk Park, Young Min Kim, Ha-Sik Kim, Bong Sun You, Chang Dong Yim
  • Publication number: 20140116580
    Abstract: Disclosed are a magnesium (Mg) alloy and a manufacturing method thereof. The Mg alloy has a composition including, by weight, 4% to 10% of Sn, 0.05% to 1.0% of Ca, 0.1% to 2% of at least one element selected from the group including Y and Er, the balance of Mg, and the other unavoidable impurities. The Mg alloy includes an Mg2Sn phase having excellent thermal stability, and is capable of being heat treated at a temperature of 480° C. or more.
    Type: Application
    Filed: February 1, 2013
    Publication date: May 1, 2014
    Applicant: KOREA INSTITUTE OF MACHINERY & MATERIALS
    Inventors: Young Min Kim, Ha Sik Kim, Bong Sun You, Chang Dong Yim, Sung Hyuk Park
  • Publication number: 20130280121
    Abstract: A magnesium alloy that forms a stable protective film on the surface of molten metal, having excellent ignition resistance restricting natural ignition of a chip thereof as well as having excellent strength and ductility, so that the Mg alloy can be melted and cast in the air or a common inert atmosphere. The magnesium alloy includes, by weight, 7.0% or greater but less than 11% of Al, 0.05% to 2.0% of Ca, 0.05% to 2.0% of Y, greater than 0% but not greater than 6.0% of Zn, and the balance of Mg, and the other unavoidable impurities. The total content of the Ca and the Y is equal to or greater than 0.1% but less than 2.5% of the total weight of the magnesium alloy.
    Type: Application
    Filed: October 4, 2011
    Publication date: October 24, 2013
    Applicant: KOREA INSTITUTE OF MACHINERY & MATERIALS
    Inventors: Young Min Kim, Ha Sik Kim, Bong Sun You, Chang Dong Yim
  • Publication number: 20130183193
    Abstract: A magnesium alloy that has excellent ignition resistance and is excellent in both strength and ductility. The magnesium alloy includes, by weight, 1.0% or greater but less than 7.0% of Al, 0.05% to 2.0% of Ca, 0.05% to 2.0% of Y, greater than 0% but not greater than 6.0% of Zn, and the balance of Mg, and the other unavoidable impurities. The total content of the Ca and the Y is equal to or greater than 0.1% but less than 2.5% of the total weight of the magnesium alloy. The Mg alloy forms a dense composite oxide layer that acts as a protective film. Thus the Mg alloy has very excellent oxidation resistance and ignition resistance, can be melted, cast and machined in the air or a common inert atmosphere (Ar or N2), and can reduce the spontaneous ignition of chips that are accumulated during the process of machining.
    Type: Application
    Filed: October 4, 2011
    Publication date: July 18, 2013
    Applicant: KOREA INSTITUTE OF MACHINERY & MATERIALS
    Inventors: Young Min Kim, Ha Sik Kim, Bong Sun You, Chang Dong Yim
  • Patent number: 7814962
    Abstract: A horizontal continuous casting apparatus for continuously manufacturing a magnesium alloy plate and a method of manufacturing a magnesium alloy plate using the same. The horizontal continuous casting apparatus is structured such that the cross-sectional area of the plate is equal to or smaller than that of a melt inlet, and includes a cooling unit for indirectly cooling the melt using a cooling jacket provided to the outer wall of the mold and/or for directly cooling the melt through spraying of cooling water, and a drawing unit having a multi-step drawing cycle. Thereby, magnesium alloy plates having various sizes can be safely and continuously cast.
    Type: Grant
    Filed: November 19, 2004
    Date of Patent: October 19, 2010
    Assignee: Korea Institute of Machinery and Materials
    Inventors: Bong-Sun You, Ha-Sik Kim, Chang-Dong Yim, Beom-Sik Kam
  • Publication number: 20070284075
    Abstract: A horizontal continuous casting apparatus for continuously manufacturing a magnesium alloy plate and a method of manufacturing a magnesium alloy plate using the same. The horizontal continuous casting apparatus is structured such that the cross-sectional area of the plate is equal to or smaller than that of a melt inlet, and includes a cooling unit for indirectly cooling the melt using a cooling jacket provided to the outer wall of the mold and/or for directly cooling the melt through spraying of cooling water, and a drawing unit having a multi-step drawing cycle. Thereby, magnesium alloy plates having various sizes can be safely and continuously cast.
    Type: Application
    Filed: November 19, 2004
    Publication date: December 13, 2007
    Inventors: Bong-Sun You, Ha-Sik Kim, Chang-Dong Yim, Beom-Sik Kam