本文選題：聚晶金剛石 + 脫鈷�。� 參考：《材料科學(xué)與工程學(xué)報(bào)》2017年01期

【摘要】：本文介紹了一種在堿性電解液中電解聚晶金剛石內(nèi)金屬鈷的方法。通過(guò)BSE觀察到聚晶金剛石內(nèi)金屬鈷的堆積方式有兩種:大部分鈷沿著金剛石顆粒邊界延伸并包圍金剛石顆粒,少量的鈷團(tuán)聚在一起,呈島狀堆積。EDS確定脫鈷區(qū)域殘余的鈷含量為2.75%,而未脫鈷區(qū)域的鈷含量為13.45%,即79.5%鈷在電解過(guò)程中溶解,且深度為170μm。模擬聚晶金剛石復(fù)合片在鉆頭胎體合金上面的焊接溫度,對(duì)脫鈷及未脫鈷聚晶金剛石復(fù)合片進(jìn)行熱處理,用光學(xué)體式顯微鏡觀察其表面的裂紋,采用XRD固定ψ法檢測(cè)脫鈷聚晶金剛石的殘余熱應(yīng)力僅為241.46kg·mm-2,而未脫鈷試樣殘余熱應(yīng)力值為2094.79kg·mm-2,即脫鈷處理能有效降低聚晶金剛石復(fù)合片在下井使用前的熱應(yīng)力,使其殘余熱應(yīng)力降低至原來(lái)的1/10。
[Abstract]:A method for electrolysis of cobalt in polycrystalline diamond in alkaline electrolyte is introduced in this paper.There are two ways of metal cobalt accumulation in polycrystalline diamond observed by BSE: most cobalt extends along the boundary of diamond particles and surrounds diamond particles, and a small amount of cobalt agglomerates together.The residual cobalt content in the decobalt region was determined to be 2.75% by EDS, while the cobalt content in the uncobalted area was 13.45%, that is, 79.5% cobalt dissolved in the electrolysis process, and the depth was 170 渭 m.Simulating the welding temperature of polycrystalline diamond composite on the matrix alloy of drill bit, heat treatment was carried out on the decobalt and uncobalted polycrystalline diamond composite, and the surface cracks were observed by optical microscope.The residual thermal stress of decobalt polycrystalline diamond detected by XRD fixed 蠄 method is only 241.46kg mm-2, while the residual thermal stress value of uncobalted sample is 2094.79kg mm-2, that is to say, the thermal stress of polycrystalline diamond composite sheet before well use can be effectively reduced by decobalt treatment.The residual thermal stress is reduced to 1 / 10 of the original.
【作者單位】： 西南石油大學(xué)材料科學(xué)與工程學(xué)院;
【分類號(hào)】：TQ163;TE921.1

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