(1. 湖南科技大學(xué) 海洋礦產(chǎn)資源探采裝備與安全技術(shù)國(guó)家地方聯(lián)合工程實(shí)驗(yàn)室，湘潭 411201； 2. 中南大學(xué) 有色金屬成礦預(yù)測(cè)與地質(zhì)環(huán)境監(jiān)測(cè)教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 基于孕鑲金剛石鉆頭在堅(jiān)硬復(fù)雜地層鉆進(jìn)效率低的現(xiàn)象，將SiC、棕剛玉和合金鋼丸作為胎體耐磨性弱化顆粒添加至胎體中，采用室內(nèi)鉆進(jìn)及SEM掃描電鏡分析等手段研究硬質(zhì)磨粒材質(zhì)對(duì)胎體力學(xué)性能和摩擦磨損行為的影響。結(jié)果表明：在胎體中添加適當(dāng)材質(zhì)的硬質(zhì)磨粒，可提高鉆頭的鉆進(jìn)時(shí)效，能夠避免鉆進(jìn)打滑現(xiàn)象；SiC磨粒對(duì)胎體的耐磨性、抗彎強(qiáng)度等力學(xué)性能影響較明顯，宜作為胎體耐磨性弱化顆粒，其濃度宜控制在20%~40%之間，粒徑在425~500 μm之間；硬質(zhì)磨粒在胎體中一方面利用其易脆性破碎的物理力學(xué)特性改善胎體微觀磨損形貌，為金剛石正常出刃創(chuàng)造前提條件；另一方面破碎脫落的游離態(tài)磨粒利用其硬脆特性能夠直接對(duì)單顆粒金剛石產(chǎn)生修銳效應(yīng)。
關(guān)鍵字: 胎體耐磨性弱化；孕鑲金剛石鉆頭；碎巖機(jī)理；硬質(zhì)磨粒；耐磨匹配性
（1. National Local Joint Engineering Laboratory of Marine Mineral Resources Exploration Equipment and Safety Technology, Hunan University of Science and Technology, Xiangtan 411201, China; 2. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Central South University, Changsha 410083, China）
Abstract:Based on drilling efficiency decrease when diamond bit drilling extra-hard and strong-abrasive rocks, brown corundum, SiC and cemented carbide shot particle were taken as matrix weaken elements and put into matrix. The matrix weaken particle materials influences on matrix structure, friction and wear characteristics were studied by interior drilling test and SEM. The result show that matrix weaken particle can enhance drilling efficiency and avoiding drilling slipping. SiC particle can remarkable influence wear-resisting and bending strength of matrix, the suitable concentration is 20%-40%, grain size is 425-500 μm. The main effect of hard abrasive particles in matrix is improve the micro wear morphology for diamond exposure by brittle characteristics and sharpening diamond by hard characteristics.
Key words: weakening matrix; impregnated diamond bit; rock fragmentation mechanism; particle for weakening matrix; wear resistance
