Synergistic effect of surface textures and DLC coatings for enhancing friction and wear performances of Si3N4/TiC ceramic

Optical Quality Laser Polishing of CVD Diamond by UV Pulsed Laser Irradiation

Diamond and graphene are the most widely used carbon allotropes and offer great potential for developing mechanical, electronic, energy-storage, and sensor applications. Their combination, especially interfacial covalent bonding, can impart excellent properties. However, achieving interfacial covalent bonding with superior performance using flexible and low-power strategies remains challenging. This study developed a novel instantaneous transformation method from diamond to graphene to prepare a new covalent structure of diamond–nano-graphite–graphene (CDGG). That is, a nanosecond-pulse laser induces sp3-to-sp2 instantaneous transformations from diamond to graphite in air, and the subsequent mechanical cleavage overcomes the weak van der Waals forces to achieve the final transformation of graphite to graphene. First, the key factors influencing laser-induced graphitization and mechanical cleavage were investigated, and a covalent carbon structure with multidirectional graphene was obtained. Furthermore, the mechanisms encompassing the lattice transformation, interface relationships, transformation time, and interface bonding were elucidated. The obtained new structure synergized the excellent properties of diamond, nano-graphite, and graphene, exhibiting superior lubrication, mechanochemical wear resistance, durability, and load-capacity. Compared to polished diamond, the obtained structure exhibited a significant decrease in the stable coefficient of friction by 49–59 % and a reduction of more than one order of magnitude in the relative wear rate under high friction against ferrous metals with a normal load of 1–9 N. Even under a heavy load of 100 N, it still exhibited superior lubrication and mechanochemical wear resistance. Finally, the preparation and patterning of covalent carbon structures were achieved on various diamond surfaces with high efficiency, environmental friendliness, and low power. This study is expected to broaden the scope of developing and applying diamond, diamond films, and graphene devices. 

Instantaneous formation of covalently bonded diamond–graphite–graphene with synergistic properties

Aluminium nitride (AlN) ceramic is a typically difficult-to-machine material used in electronic packaging. Laser and chemical milling enhanced micro milling (LCMEM), a high-quality and efficient processing method for AlN, is proposed in this study. Rough machining is completed by repeated alternating laser ablation and chemical removal; the final finish is achieved by micro milling (MM). To achieve precise laser and chemical milling parameters based on the target structure, a laser and chemical milling (LCM) prediction model is established and verified; this can be used to predict the morphology of the grooves after LCM. The change trend of the grooves after LCM with the laser parameters is investigated. It was found that LCMEM can improve the surface quality by 60%, and an optimal finishing surface with a surface roughness Ra value of 54 nm can be obtained when the feed per tooth is 0.4 μm/z. Lastly, this study uses LCMEM to produce a high aspect ratio groove with aspect ratio of 2.5 and depth of 1250 μm. Compared with conventional MM, LCMEM reduces the allowance of MM by 71.95%, improves the groove accuracy, and reduces tool wear. 

Fabrication of high aspect ratio grooves on aluminium nitride by laser and chemical milling enhanced micro milling

Surface modeling and component analysis of picosecond laser ablation of CVD diamond

The invention provides a brazing method of a CVD diamond micro milling cutter. The brazing method comprises the steps that firstly, a hard alloy cutter handle is prepared; ultrasonic cleaning is carried out on the hard alloy knife handle and a CVD diamond blade; the surface of the welding part is coated with soldering flux; the CVD diamond micro cutter is assembled; and the CVD diamond micro cutter is brazed in air at the low temperature. According to the method, the thermal damage degree of the diamond blade during welding of the CVD diamond micro cutter is reduced, rapid welding between theCVD diamond blade and the hard alloy cutter handle is achieved, the CVD diamond micro cutter is welded through an ultrahigh-frequency induction brazing machine in air, and meanwhile the welding strength and precision are guaranteed; and in addition, the method is easy to operate and high in efficiency, and the welding cost of the CVD diamond micro cutter is greatly reduced.

Brazing method of CVD diamond micro milling cutter

SKD11 is widely used in manufacturing die. With the development of industrial level, the size of the die is further reduced, and the difficult processing problem of high aspect ratio (HAR) micro-structures is exposed. Micro-milling is a suitable method for machining HAR micro-structures; however, the inevitable generation of burrs deteriorates the machined surface. Previous studies have mostly focused on the burr formation process of shallow grooves but have ignored HAR grooves. This paper investigated the burr formation mechanism in HAR (2:1) grooves on harden steel (SKD11). Due to the fact that the burr formation process was difficult to be observed in the actual micro-milling process, a finite element model was established. A corresponding experimental research was conducted, which revealed a good consistency between simulation and experimental results. Moreover, a new burr type was formed on the sidewall of the HAR groove, which was transformed from top burrs and was named as side burr. The results demonstrated that the chip flow on the rake face of the micro-mill was hindered by the sidewall, which caused chip crumbling, chip accumulation, and surface scraping, seriously affecting the burr formation mechanism. This paper revealed the burr formation mechanism for HAR grooves on SKD11, which provides basic data for manufacturing die with complex structure and small size.

/pdf/study-on-the-burr-formation-process-in-micro-milling-of-high-1053aa3rvb.pdf

Study on the burr formation process in micro-milling of high aspect ratio structures

Rapid fabrication of surface microstructures on AlN HTCC substrate by chemically assisted laser ablation

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Papers

Surface modeling and component analysis of picosecond laser ablation of CVD diamond

Brazing method of CVD diamond micro milling cutter

Study on the burr formation process in micro-milling of high aspect ratio structures

Rapid fabrication of surface microstructures on AlN HTCC substrate by chemically assisted laser ablation