(1. 西安交通大學 金屬材料強度國家重點實驗室，西安 710049;
2. 西安理工大學 機械與精密儀器工程學院， 西安 710048)
摘 要: 采用非平衡磁控濺射離子鍍技術(shù)制備碳膜, 通過對刀具后刀面磨損曲線、 切削力以及所加工孔精度的分析， 證明高硬度低摩擦因數(shù)碳膜高速鋼刀具在干切削條件下鉆削鋁硅合金時具有良好的切削性能。 同時采用OM、 SEM、 XPS和EDS等方法對切削過程中碳膜的減摩效應(yīng)進行探討， 證明碳膜改善刀具抗粘結(jié)能力的本質(zhì)在于碳元素對鋁硅合金的潤濕性較差， 而非在摩擦過程中生成碳轉(zhuǎn)移膜。 切削過程中碳膜的熱穩(wěn)定性越好， 碳膜刀具的壽命就越長， 一旦碳膜破壞， 則刀具迅速發(fā)生粘結(jié)失效。
關(guān)鍵字: 碳膜； Al-Si合金； 干式切削； 減摩； 潤濕性
drilling of Al-Si alloy
（1. State Key Laboratory for Mechanical Behavior of Materials,
Xi'an Jiaotong University, Xi'an 710049, China;
2. School of Machinery and Precision Instrument Engineering,
Xi'an University of Technology, Xi'an 710048, China）
Abstract: Two kinds of carbon coatings with high hardness and low coefficient of friction were deposited by closed filed unbalanced magnetron sputtered ion plating techniques. By the analysis of flank wear, the cutting force curves and the dispersion of cutting holes and the carbon coated tools show excellent cutting performance in dry cutting of Al-Si alloys. Through OM, SEM, XPS and EDS, the low adherence of carbon coated tools can be attributed to the low wettability between the Al-Si alloys and carbon instead of forming carbon transfer film during wear. The higher the thermal stability of carbon coating is, the longer of the cutting tools life is. The catastrophic adhesive wear may occur once the carbon coating fails.
Key words: carbon coating; Al-Si alloy; dry cutting; low wear rate; wettability
