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Effects of temperature and plasma treatment on mechanical properties of ceramic fibres

100%

Xiem N. T. , Kroisová D. , Louda P. , Hung T. D. , Rozek Z.

2009

tom Vol. 37, nr 2

526-531

Purpose: The aim of this study is an investigation and comparison of mechanical properties of ceramic fibres after they were influenced by temperature and plasma treatment. Design/methodology/approach: Single filament after being processed at different temperatures (200oC, 400oC, 700oC and 1000oC) and methane plasma treatment was separated with a magnifier, prepared on a punched mounting tab, and was evaluated in accordance with Japanese Industrial Standard. Findings: Preliminary results of the improvement in tensile strength, Young’s modulus, elongation of ceramic fibres after plasma treatment are studied in this paper. Research limitations/implications: The samples were tested for optimized parameters of plasma modification and optimized parameters of plasma to ceramic fibres curing. There was not enough time to test the adhesion between Geopolymer matrices and ceramic fibres. Practical implications: In the future, our work will be focused on optimization of parameters for plasma modification of fibres made of different materials and applying this method to improve the fibre and Geopolymer matrix adhesion. Originality/value: The value of this work is defined by the influence of plasma treatment parameters on quality, mechanical properties of ceramic fibres and increasing the adhesion between matrices and reinforcements.

The effect of micropores on output properties of laminate materials with assumed medical implantation

100%

Dobrzański L. A. , Pusz A. , Nowak A. J.

2009

tom Vol. 37, nr 2

408-415

Purpose: Examination of elaborated composite material in terms of specific application in medicine – as internal prostheses of oesophagus. Development of the manufacturing technology of aramid-silicon laminated material and definition of the micro-cavities amount formed during production of the laminates. Design/methodology/approach: Aramid-silicon laminated material was made by a method of manual formation of laminates that is impregnation of reinforcement with matrix to hardening silicone process using hardening methods connected with heat. Created material was observed on Axiovert 450M light-microscope of Option Company at 100 x magnification. Findings: The results show that the preliminary manufacturing technology of aramid-silicon laminated materials allows creating a material with specific and special properties. Aramid-silicone laminate could be used in medicine for example as oesophagus prosthesis. Research limitations/implications: Carried out investigations show the problem with cautioning and ageing which are very important in having proper percentage of intensifier in developed material. Originality/value: Taking the material specific properties into account it seems that the aramid-silicon laminated material would be useful in medicine. Aramid silicone laminate could be attractive alternatively for composite material used for medical purposes and the others.

Performance assessment of lapinus–aramid based brake pad hybrid phenolic composites in friction braking

71%

Singh T. , Patnaik A.

tom Vol. 15, no. 1

151--161

The brake pad hybrid phenolic composites based on lapinus–aramid fibre combination are designed, fabricated and characterized for various physical, chemical, mechanical, thermo-mechanical and tribo-performance. The physical properties such as water absorption, compressibility, void and ash contents increase with increase in lapinus fibre, whereas mechanical (such as hardness, impact energy, tensile and flexural strengths) and thermo-mechanical (loss-tangent, storage and loss modulus) properties increase with increase in aramid fibre. The assessment of braking performance is done using a standard test protocol conforming to ECE R-90 regulation on the Krauss friction testing machine. Comprehensively, it is found that incorporation of higher metallic-silicate lapinus fibre in formulation relative to aramid enhances the overall frictional response. The same successfully arrests highest rise in the disc temperature even though wear losses are maximized. The same show lowest fading and excellent recovery performance. Optimally the formulation having lapinus-to-aramid proportion 25:5 experimentally optimizes the overall braking performance. The SEM micrograph study justifies the overall braking tribology and the associated wear mechanisms.