The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 2017
Filed:
Dec. 09, 2011
Hyun Kuk Park, Iksan-si, KR;
Ik Hyun OH, Gwangju, KR;
Hee Jun Yoon, Buan-gun, KR;
Hyeon Taek Son, Gwangju, KR;
Kwang Jin Lee, Jeonju-si, KR;
Hee Seon Bang, Gwangju, KR;
Han Sur Bang, Gwangju, KR;
Hyun Kuk Park, Iksan-si, KR;
Ik Hyun Oh, Gwangju, KR;
Hee Jun Yoon, Buan-gun, KR;
Hyeon Taek Son, Gwangju, KR;
Kwang Jin Lee, Jeonju-si, KR;
Hee Seon Bang, Gwangju, KR;
Han Sur Bang, Gwangju, KR;
KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY, Cheonansi, KR;
Abstract
The present invention relates to a preparation method of a tungsten carbide sintered body for a friction stir welding tool used in a friction stir welding tool of a high melting point material such as steel, titanium and the like or a dissimilar material such as aluminum, magnesium-steel, titanium and the like. The preparation method comprises the following steps: filling a tungsten carbide (WC) powder in a mold made of a graphite material; mounting the mold filled with tungsten carbide powder in a chamber of a discharge plasma sintering apparatus; making a vacuum inside of the chamber; molding the tungsten carbide powder while maintaining a constant pressure inside the mold and increasing the temperature according to a set heat increase pattern until the temperature reaches a final target temperature; and cooling the inside of the chamber while maintaining the pressure pressurized in the mold after the molding step.