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2. 发明申请

US20140191443A1 PREPARATION METHOD OF TUNGSTEN CARBIDE SINTERED BODY FOR FRICTION STIR WELDING TOOL 有权
标题翻译：用于摩擦焊接工具的碳化钨烧结体的制备方法
公开(公告)号：US20140191443A1
公开(公告)日：2014-07-10
申请号：US14233424
申请日：2011-12-09
申请人： Hyun Kuk Park , Ik Hyun Oh , Hee Jun Yoon , Hyeon Taek Son , Kwang Jin Lee , Hee Seon Bang , Han Sur Bang
发明人： Hyun Kuk Park , Ik Hyun Oh , Hee Jun Yoon , Hyeon Taek Son , Kwang Jin Lee , Hee Seon Bang , Han Sur Bang
IPC分类号： C04B35/64 , C04B35/56 , B23K20/12
CPC分类号： C04B35/64 , B22F3/105 , B23K20/1245 , C04B35/5626 , C04B35/645 , C04B2235/6562 , C04B2235/6581 , C04B2235/666 , C04B2235/77 , C04B2235/96 , C22C29/08
摘要： 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 using pulsed current activation through a discharge plasma sintering apparatus. 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. According to the preparation method of a tungsten carbide sintered body for a friction stir welding tool, it is possible to obtain a high relative density of 99.5% or higher, and to prepare a uniform sintered body having a homogeneous tissue with little particle growth, high toughness, high abrasion resistance and high strength within a short time by a single process when preparing a tungsten carbide sintered body appropriate for a friction stir welding tool by using pulsed current activation through a discharge plasma sintering apparatus. In addition, since a sintered body is prepared with only a tungsten carbide single material, excluding a sintering additive such as cobalt, a preparation method is simplified, preparation costs are reduced, and toughness, abrasion resistance and strength are superior compared with a sintered body containing cobalt, a sintering additive.
摘要翻译：本发明涉及一种用于摩擦搅拌焊接工具的碳化钨烧结体的制备方法，该工具用于诸如钢，钛等的高熔点材料的摩擦搅拌焊接工具或诸如铝，镁之类的异种材料钢，钛等，通过放电等离子体烧结装置进行脉冲电流激活。该制备方法包括以下步骤：在由石墨材料制成的模具中填充碳化钨（WC）粉末; 将填充有碳化钨粉末的模具安装在放电等离子体烧结装置的腔室中; 在室内进行真空; 在模具内保持恒定压力的同时成型碳化钨粉末，并根据设定的热量增加模式增加温度，直到温度达到最终目标温度; 并且在模制步骤之后保持在模具中加压的压力同时冷却腔室的内部。根据用于摩擦搅拌焊接工具的碳化钨烧结体的制备方法，可以获得99.5％以上的高相对密度，并且制备均匀的具有少量颗粒生长的均匀组织的烧结体，高当通过使用脉冲电流激活通过放电等离子体烧结装置制备适用于摩擦搅拌焊接工具的碳化钨烧结体时，通过单一工艺在短时间内具有韧性，高耐磨性和高强度。此外，由于仅使用碳化钨单一材料制成烧结体，不包括钴等烧结添加剂，因此制备方法简单，制备成本降低，韧性，耐磨耗性和强度高于烧结体含钴，烧结添加剂。

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