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정제기,옥정중,김용환,조이제,박용호 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.6
The aim of this study was to investigate the transition of wear behavior for pure aluminum and extruded aluminumalloy 2024-T4 (AA2024-T4). The wear test was carried using a ball-on-disc wear testing machine at various verticalloads and linear speeds. The transition of wear behaviors was analyzed based on the microstructure, weartracks, wear cross-section, and wear debris. The critical wear rates for each material are occurred at lower linearspeed for each vertical load. The transition of wear behavior was observed in which abrasion wears with the generationof an oxide layer, fracture of oxide layer, adhesion wear, severe adhesion wear, and the generation of seizureoccurred in sequence. In case of the pure aluminum, the change of wear debris occurred in the order of blocky,flake, and needle-like debris. Cutting chip, flake-like, and coarse flake-like debris was occurred in sequence for theextruded AA2024-T4. The transition in the wear behavior of extruded AA2024-T4 occurred slower than in purealuminum.
Methyl Polysiloxane 을 主劑로 한 撥水加工에 關한 硏究(Ⅱ)
鄭濟石 慶北工業專門大學 1980 論文集 Vol.17 No.-
Methyl Polysiloxane made from Methyl Cholorosilane is diluted to be 1,2,3,4% (Weight) solution in carbon tetrachloride. After cotton woven cloths is immersed in the solution and cured during the heat setting, the degree of water-repellency is measured by spray method described in KS K 0590. Following result is obtained: 1) Residue of Methyl Chlorosilane mixture, intermediate products of silicones, can be used as a Water-repellency agent. 2) As we treated the cotton fabrics over 2% of Methyl Polysiloxane solution, the effect of Water-repellency were satisfied oven against laundering cotton fabrics for 5 times. 3) Optimum finishing conditions of the Methyl Polysiloxane solution to cotton fabrics are 85±2% of wet up, 60℃ of preliminary dry for 3 minutes, 140℃ of curing for 3 minutes. 4) Tearing strength of Water-repellency finishing to cotton fabrics were diminished 28.5% than of untreated fabrics. 5) 6% (o.w.f.) hydrogen peroxide finishing to cotton fabrics after curing process are contributed to help increasing smoothness, whiteness and aboiding bad odor.