文章信息/Info

Title:

Research Progress on Induction Mechanism of Graphitization Phase Transition of Diamond Materials

文章編號:

1674-3962(2022)07-0536-11

作者:

盧康1; 許競翔1; 2; 孫強1; 褚振華1

（1.上海海洋大學工程學院，上海 201306）（2.上海海洋可再生能源工程技術研究中心，上海 201306）

Author(s):

LU Kang1;  XU Jingxiang1; 2;  SUN Qiang1;  CHU Zhenhua1

(1. College of Engineering Science and Technology, Shanghai Ocean University, Shanghai 201306, China) (2. Shanghai Engineering Research Center of Marine Renewable Energy, Shanghai 201306, China)

關鍵詞:

金剛石; 石墨化; 激光誘導; 應力誘導; 金屬催化誘導

Keywords:

diamond;  graphitization;  laser induction;  stress induction;  metal catalytic induction

分類號:

TB383;O792

DOI:

10.7502/j.issn.1674-3962.202012028

文獻標志碼:

A

摘要:

金剛石材料的石墨化行為降低了其加工難度，因此，研究誘導金剛石石墨化的因素有望為金剛石加工技術的革新與開發提供新的線索。總結了激光參數和應力對金剛石石墨化的誘導機制。激光誘導金剛石石墨化主要是指短脈沖激光在金剛石加工過程中的升溫誘導，即高能激光引起溫度的急劇升高，使金剛石的碳碳鍵斷鍵重連而形成石墨結構的過程；此外，激光能量密度、脈沖寬度、脈沖數量、激光功率和掃描速率在激光加工過程中相互關聯，共同影響金剛石石墨化的過程。應力誘導主要是指拋光或壓痕加工過程中，通過增加壓力來改變金剛石立方晶體結構的鍵長和鍵角而使金剛石結構變得不穩定，隨后的再減壓過程使碳原子從被壓縮的不穩定金剛石相轉變為穩定石墨相；此外，過渡金屬如鐵、鉻、鈷、鎳、鉑、鈦等對金剛石石墨化相變的催化作用主要表現在金屬價層結構中存在的未配對電子和金剛石表層原子的電子配對形成化學鍵使碳原子移動重構為石墨結構。基于金剛石石墨化誘導機制提出如何改進金剛石材料加工過程中的效率，并根據石墨化特點改善金剛石材料的表面性能。

Abstract:

Surface graphitization behavior of diamond reduces the machining difficulty of diamond materials, thus, research on the factors that induce graphitization of diamond is expected to provide new clues for the technological innovation and development of diamond processing methods. The induction mechanism of laser parameters and stress on diamond graphitization is summarized. Laser induced graphitization mainly refers to the heating induction of short pulse laser during diamond processing, that is, the short pulse laser leads to a sharp raise of temperature, breaks the carbon-carbon bonds of diamond and reconnects them to form graphite structure. In addition, laser energy density, pulse width, number of pulses, laser power and laser pulse repetition frequency are related to each other during laser processing, which together affect the process of diamond graphitization.Stress induction mainly refers to polishing or indentation process, by increasing the pressure to change the bond length and bond angle of the diamond structure to make the diamond structure unstable, and the subsequent decompression process makes its compressed unstable diamond phase change to a stable graphite phase. Moreover, transitional metals such as iron, chromium, cobalt, nickel, platinum, and titanium have catalytic effects on the graphitization phase transition of diamond, which are mainly manifested as: the unpaired electrons in the metal valence layer structure pair with the electrons on the diamond surface to form a chemical bond to further reconstruct the graphite structure. Based on the diamond graphitization induction mechanism, it is proposed how to improve the processing efficiency in the processing of diamond materials and improve the surface properties of diamond materials according to the characteristics of graphitization.