Hydrophobic surgical forceps of end-effectors for laparoscopic operations or minimally invasive surgery were developed through powder injection molding (PIM) and surface treatment. Processing conditions for mixing, debinding, and sintering were investigated to produce defect-free components. An optimum solid loading was determined by torque rheometry experiments. The optimized processing conditions for debinding and sintering were designed through the measurement of weight loss and shrinkage behavior by thermogravimetric analysis and dilatometry experiments. After producing the surgical forceps based on the optimized processing conditions via PIM, surface treatment was carried out to generate the hydrophobic structure on the surface.
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Purpose: In this paper the development of technology for production of copper nanoparticles by thermal debinding matrix nanocomposite polymer nanofibers with reinforced of copper was reported. Electrospinning technique was used to synthesis composite nanofibers using a precursor composed of poly(vinyl alcohol) (PVA), copper acetate (CuAC) and acetic acid (C2H3OH). The resulting nanofiber was subjected to a high temperature in order to debinding of the organic part. The aim of this study was to attempt to obtain a one-dimensional nanostructured materials. Design/methodology/approach: The resulting nanostructures have been characterized using high resolution scanning electron microscopy (SEM). The influence of debinding conditions on one-dimensional nanostructured materials was observed. Research was execute on scanning electron microscope. Findings: On the basis of carried out researches the impact of the debinding of nanocomposite polymer nanofibers on the diameter of obtained nanostructures have been shown. The influence of debinding conditions on composite nanofibers were determined. Research limitations/implications: The research was carried out on technological variants, not on final elements. Originality/value: The paper presents attempt to obtain a one-dimensional nanostructured materials.
This paper presents and discusses individual phases of forming micro parts using the injection moulding method. Tests involving the preparing of feedstock for the process of injection micro moulding were conducted. The rheological properties for binder-powder compositions were also defined. Tests were conducted for 316L stainless steel and iron metal powders and Al2O3 ceramics with granularity ranging from 0.135 žm to 16 žm. Binders consisted of polyethylene, paraffin and wax. Technological parameters of the process of injection micro moulding are presented, including the impact of individual factors on the filling of the mould cavities. Moreover, results of tests with respect to the shrinking of the micro parts as well as of the structure of the material following sintering are presented.
Optoform LLC developed a technology to process paste compositions based upon photo-curable resins and fillers. This new process is called by Optoform LLC : the direct composite manufacturing This technique is quite flexible and allows the development of very different materials(polymeric, metallic, ceramic). This paper is an overview of the use limitation and the advantages of materials developed by the CRIF or by other teams. Materials requiring or not a post-processing step have been developed. The limits or restrictions of use of these materials have been studied in order to meet the requirements and needs of various industrial sectors in the United States and in Europe (e.g. car racing, aerospace and aeronautical sectors, tooling industries, ...).
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