Journal ArticleDOI
A review on the importance of surface coating of micro/nano-mold in micro/nano-molding processes
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TLDR
In this paper, the physical, mechanical and tribological properties of various surface coatings and their impact on the replication efficiency and lifetime of micro/nano-molds that are used in micro-nano hot-embossing and injection molding processes are discussed.Abstract:
Micro/nano hot-embossing and injection molding are two promising manufacturing processes for the mass production of workpieces bearing micro/nanoscale features. However, both the workpiece and micro/nano-mold are susceptive to structural damage due to high thermal stress, adhesion and friction, which occur at the interface between the workpiece and the mold during these processes. Hence, major constraints of micro/nano-molds are mainly attributed to improper replication and their inability to withstand a prolonged sliding surface contact because of high sidewall friction and/or high adhesion. Consequently, there is a need for proper surface coating as it can improve the surface properties of micro/nano-molds such as having a low friction coefficient, low adhesion and low wear rate. This review deals with the physical, mechanical and tribological properties of various surface coatings and their impact on the replication efficiency and lifetime of micro/nano-molds that are used in micro/nano hot-embossing and injection molding processes.read more
Citations
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Frictional Characteristics of Atomically-Thin Sheets
TL;DR: Using friction force microscopy, the nanoscale frictional characteristics of atomically thin sheets of graphene, molybdenum disulfide, niobium diselenide, and hexagonal boron nitride are compared to those of their bulk counterparts, suggesting that the trend arises from the thinner sheets’ increased susceptibility to out-of-plane elastic deformation.
Journal ArticleDOI
Micro-nanostructured polymer surfaces using injection molding: A review
TL;DR: In this article, the influence of processing parameters on the quality of final parts and the precision of final product dimensions in both thermoplastic polymers and rubber materials is discussed and compared.
Journal ArticleDOI
Solvent-aided direct adhesion of a metal/polymer joint using micro/nano hierarchical structures
TL;DR: In this article, a new direct adhesion method is introduced that does not require additional heat management and instead makes use of an organic solvent, which is used to bond micro/nanostructured aluminum and acrylonitrile butadiene styrene.
References
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Journal ArticleDOI
Hot embossing precise structure onto plastic plates by ultrasonic vibration
Shih-Jung Liu,Yu-Tsai Dung +1 more
TL;DR: In this paper, the authors used ultrasonic vibration as a heat generator for hot embossing of polymeric plates and found that it could provide significant advantages in terms of a shorter cycle time as well as improved product quality.
Journal ArticleDOI
Superhard coatings for metal cutting applications
TL;DR: In this paper, the authors present superhard coated tools, with an emphasis on diamond coated WC-Co tools, the corresponding deposition technologies and the foreseen metal cutting applications, and the precursors of these tools.
Journal ArticleDOI
Thickness dependence of elastic modulus and hardness of on-wafer low-k ultrathin polytetrafluoroethylene films
TL;DR: In this article, the authors used the dynamic contact module (DCM) in a frequency-specific depth-sensing indentation to investigate the elastic modulus and hardness of polytetrafluoroethylene (PET) films in the thickness range of 48.1 to 1,141 nm.
Journal ArticleDOI
Performance of chromium nitride and titanium nitride coatings during plastic injection moulding
Luís Miguel Cunha,Martin Andritschky,K. Pischow,Z. Wang,A. Zarychta,A.S. Miranda,António M. Cunha +6 more
TL;DR: In this article, the performance of the coatings during plastic processing was tested in a dye fitted to an injection molding machine and using glass reinforced thermoplastic, and the wear rates of the nitride-based coatings were more than two orders of magnitude better then some traditional methods of protecting the surfaces such as hardening the steel by heat treatment, electrodepositing hard chromium or nitriding the steel surface.
Journal ArticleDOI
Human micro-vascular endothelial cell seeding on Cr-DLC thin films for mechanical heart valve applications
N. Ali,Y. Kousar,T.I.T. Okpalugo,Varshni Singh,M. Pease,A.A. Ogwu,José Grácio,Elby Titus,Efstathios I. Meletis,Mark J. Jackson +9 more
TL;DR: Endothelial cell adhesion and growth was found to be affected by changing the Cr content of Cr-DLC films, and the biological response of human micro-vascular endothelial cells (HMV-EC) was evaluated in terms of initial cell attachment and growth.
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