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Preparation of coated sand for selective laser sintering and optimization of baking process of sand moulds

China Foundry 2023年第6期20卷 519-525页

作者： Peng-wei Wang Rui-long Yu Rui Tan Yan Wang Ying-wei Zhou Yue-ting Ma Yan-hai Li Jia-jun Liu Shao-kui Yin Shenyang Research Institute of Foundry Co. Ltd.CAMShenyang 110022China National Key Laboratory of Advanced Casting Technologies Shenyang 110022China

A cold method was used to prepare coated sand for application in the selective laser sintering(SLS)*** strength,loss on ignition,gas evolution,and accuracy of the SLS samples were tested and analyzed,and the baking process was thoroughly *** with coated sand prepared by the hot method,the cold method yields a more uniform and complete resin film on the sand's surface,resulting in enhanced tensile strength and ***,the cold method requires a lower binder content to meet the same strength requirements,thereby minimizing gas evolution,reducing porosity defects,and ultimately improving casting *** coated sand samples prepared through the cold method exhibit superior accuracy,with a size error of within±0.4 *** contrast,the coated sand samples prepared by the hot method display a lower accuracy,with an average negative error of 2.1993 *** highest tensile strength could be attained by controlling the baking temperature within a suitable range(180-190℃),which can effectively reduce the generation of gas,thus contributing to improved overall performance.

关键词： selective laser sintering(SLS) coated sand cold method hot method baking

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Preparation of Liquid Soap from Sheep’s Tail Fat

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Open Journal of Applied Sciences 2022年第5期12卷 662-671页

作者： Zoljargal Batnasan Pagamdulam Natsagdorj Tugsuu Tserendorj School of Applied Science and Engineering National University of Mongolia Ulaanbaatar Mongolia School of Animal Science and Biotechnology Mongolian University of Life Science Ulaanbaatar Mongolia

The aim of this study was to select sheep fat from Tsetserleg sum of Arkhangai aimag as raw material and to produce liquid soap. The oil was extracted from raw materials such as sheep’s tail fat (TF), outer fat (OF), and inner fat (IF), which were analyzed by chemical methods, and the liquid soap was obtained by cold methods. Liquid soap was prepared from three types of raw materials, each of which was mixed with 70% fat oil and 30% liquid oil. The ratio was chosen to dilute the liquid soap to 2% of the product. The most suitable oil for preparing liquid soaps from raw materials such as TFO, OFO, and IFO was the tail fat oil (TFO). The highest unsaturated fatty acid content in crude fats and oils was 41.23%, the highest content of saturated fatty acids was 22.3%, and the highest content of methyl-stearate was 33.65% by the GC-MS analytical method.

关键词： Liquid Soap Animal Oil cold method Dilution Ratio Fatty Acid

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