(1. 廣東省科學院 廣東省材料與加工研究所，廣州 510650；
2. 國家鈦及稀有金屬粉末冶金工程技術(shù)研究中心，廣州 510650)
摘 要: 采用無壓浸滲工藝制備了鑄造碳化鎢顆粒增強PDC鉆頭胎體材料，胎體材料組織均勻，胎體中碳化鎢顆粒完整，碳化鎢顆粒與銅合金基體形成均勻擴散層。重點研究了PDC鉆頭胎體的三體磨料磨損行為和磨損機理。結(jié)果表明：鑄造碳化鎢顆粒形貌是影響PDC鉆頭胎體三體磨料磨損行為的主要因素。相對于破碎鑄造碳化鎢，球形碳化鎢內(nèi)部微裂紋少且無應(yīng)力集中，具有耐磨增效作用，可顯著提高PDC鉆頭胎體材料的三體磨損性能。球形碳化鎢顆粒增強PDC鉆頭胎體的相對耐磨性是破碎碳化鎢顆粒增強PDC鉆頭胎體的10倍。破碎碳化鎢顆粒增強PDC鉆頭胎體的磨損表面呈現(xiàn)大量銅合金基體犁溝，多角狀碳化鎢顆粒被磨損變圓滑；而球形碳化鎢顆粒增強PDC鉆頭胎體的磨損表面碳化鎢顆粒突出林立，少量碳化鎢顆粒被折斷或發(fā)生破裂。
關(guān)鍵字: PDC鉆頭；鑄造碳化鎢；無壓浸滲；三體磨料磨損
（1. Guangdong Institute of Materials and Processing, Guangdong Academy of Sciences, Guangzhou 510650, China;
2. National Engineering Research Center of Powder Metallurgy of Titanium＆Rare Metals, Guangzhou 510650, China）
Abstract:Cast tungsten carbide particles reinforced PDC drill bit matrix was prepared by pressureless infiltration. The bit matrix showed a microstructure where the cast tungsten carbide particles were dispersed homogeneously in the Cu alloy. The tungsten carbide particles remained intact and formed a uniform diffusion layer with the Cu alloy matrix. The three-body abrasive wear behavior and wear mechanism of the PDC drill bit matrix were investigated. The results show that the morphology of cast tungsten carbide particles is the main factor affecting the three-body abrasive wear behavior of PDC drill bit matrix. Compared with the crushed cast tungsten carbide, fewer internal micro-cracks and no stress concentration are found in the spherical tungsten carbide, which has an increase effectiveness to resist wear and significantly improves the three-body wear performance of PDC drill bit matrix. The wear resistance of PDC drill bit matrix reinforced by spherical tungsten carbide particles is 10 times of that of PDC drill bit matrix reinforced by crushed tungsten carbide particles. The worn surface of the PDC drill bit matrix reinforced by crushed tungsten carbide particles shows furrowed Cu alloy with worn tungsten carbide particles. Whereas, on the worn surface of PDC drill bit matrix reinforced by spherical tungsten carbide particles, the tungsten carbide particles stand out and a small number of them are broken.
Key words: PDC drill bit; cast tungsten carbide; pressureless infiltration; three-body abrasive wear
