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Preparation of liquefied wood-based resins and their application in molding material 被引量:12
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作者 Zhang Qiu-hui Zhao Guang-jie +1 位作者 Yu Li-li Jie Shu-jun 《Forestry Studies in China》 CAS 2007年第1期51-56,共6页
To investigate value in use of liquefied wood-based resin applications in molding material, Chinese fir (Cunninghamia lanceolata) and poplar (Populus tomentosa) wood meal were liquefied in phenol. The reactant was... To investigate value in use of liquefied wood-based resin applications in molding material, Chinese fir (Cunninghamia lanceolata) and poplar (Populus tomentosa) wood meal were liquefied in phenol. The reactant was co-condensed with formaldehyde to obtain liquefied wood-based resin. For this paper, we investigated the characterization of the resin and its application in molding material. The result shows that the basic properties of liquefied wood-based resin were satisfactory; the bonding strength of plywood prepared with liquefied Chinese fir and liquefied poplar resin can reach 1.54 and 1.00 MPa, respectively. The compression strengths of the molding material prepared with two kinds of liquefied wood resin were 73.01 and 73.58 MPa, almost the same as that of PF resin molding material. The limiting volume swelling of molding material made with liquefied Chinese resin and liquefied poplar resin were 8.5% and 8.3%, thickness swelling rates of water absorption were 3.3% and 4.2%, and the maximum weight ratios of water absorption were 25.9% and 26.2%, respectively. The soil burial test result shows that the weight loss rate of the molding materials made with liquefied Chinese resin and liquefied poplar resin were 8.3% and 9.1% and that of the PF resin molding material was 7.9%. After the soil internment test, the reduction ratio of compression strength of the two kinds of molding material achieved 16.9% and 17.7%, while that of the PF resin molding material was 15.4%. The test results of wood fungi inoculation on the three surfaces of the molding material indicate the breeding rate of molding material prepared with liquefied Chinese resin and liquefied poplar resin were at level 4 and that of PF resin molding material was at level 1 of the ISO standard. 展开更多
关键词 liquefied wood-based resin PLYWOOD molding material BIODEGRADABILITY
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Thermodynamic Analysis on Interaction between Molten Ti Alloys and Oxide Molding Materials 被引量:1
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作者 Hongsheng DING Jun JIA Jingiie GUO and Yanqing SU National Key Laboratory of Precision Hot Processing of Metals, Harbin 150001, China HengZhi FU and Jinshan LI State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’ 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第1期99-100,共2页
A thermodynamic model has been built up for the interactions between molten Ti alloys and oxide molding materials in the way of decomposition and solution of molding materials, then the influences on the reaction free... A thermodynamic model has been built up for the interactions between molten Ti alloys and oxide molding materials in the way of decomposition and solution of molding materials, then the influences on the reaction free energy changes have been calculated and discussed. 展开更多
关键词 TI Thermodynamic Analysis on Interaction between Molten Ti Alloys and Oxide Molding materials
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Impact Resistance of a Novel Expanded Polystyrene Cement-based Material
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作者 朱洪波 LI Chen +2 位作者 WANG Peiming WU Mengxue YAN Meizhu 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第2期284-290,共7页
The mechanical property of a novel expanded polystyrene cement-based material (EPS-C), which was prepared by compressing semi-dry materials molding, was investigated. The compressive behavior was analyzed by compres... The mechanical property of a novel expanded polystyrene cement-based material (EPS-C), which was prepared by compressing semi-dry materials molding, was investigated. The compressive behavior was analyzed by compression tests to gain the energy absorbed during failure. Performance for impact resistance was tested by a self-made device. The results figures out that the EPS-C has good toughness and can reach swain of 0.7 without failure. The stress-strain curve is quite different from that of normal EPS concrete. It can be divided into three stages and in the third stage the compressing exhibits the highest energy absorption. With the rising of cement ratio, the impact force absorption (IEA) decreases first and then increases. The impact energy absorption (IEA) increases first and then decreases. The lowest IEA and the highest lEA appear at the cement dosage from 233 g/L to 267 g/L and from 233 g/L to 300 g/L, respectively. 展开更多
关键词 expanded polystyrene (EPS) CEMENT compressing semi-dry materials molding compressive'behavior impact resistance
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A review of the techniques for the mold manufacturing of micro/nanostructures for precision glass molding 被引量:7
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作者 Tianfeng Zhou Yupeng He +7 位作者 Tianxing Wang Zhanchen Zhu Ruzhen Xu Qian Yu Bin Zhao Wenxiang Zhao Peng Liu Xibin Wang 《International Journal of Extreme Manufacturing》 SCIE EI 2021年第4期23-54,共32页
Micro/nanostructured components play an important role in micro-optics and optical engineering,tribology and surface engineering,and biological and biomedical engineering,among other fields.Precision glass molding tec... Micro/nanostructured components play an important role in micro-optics and optical engineering,tribology and surface engineering,and biological and biomedical engineering,among other fields.Precision glass molding technology is the most efficient method of manufacturing micro/nanostructured glass components,the premise of which is meld manufacturing with complementary micro/nanostructures.Numerous mold manufacturing methods have been developed to fabricate extremely small and high-quality micro/nanostructures to satisfy the demands of functional micro/nanostructured glass components for various applications.Moreover,the service performance of the mold should also be carefully considered.This paper reviews a variety of technologies for manufacturing micro/nanostructured molds.The authors begin with an introduction of the extreme requirements of mold materials.The following section provides a detailed survey of the existing micro/nanostructured mold manufacturing techniques and their corresponding mold materials,including nonmechanical and mechanical methods.This paper concludes with a detailed discussion of the authors recent research on nickel-phosphorus(Ni-P)mold manufacturing and its service performance. 展开更多
关键词 precision glass molding mold manufacturing MICRO/NANOSTRUCTURE mold material extreme features
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Effect of Process Parameters on Porosity in Aluminum Lost Foam Process 被引量:7
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作者 Kiyoung KIM Kyongwhoan LEE 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第5期681-685,共5页
Porosity is a main defect in aluminum alloy castings, which is also thought to be severe in aluminum alloy castings produced by lost foam process due to the pyrolysis of the polystyrene foam pattern during pouring. Fu... Porosity is a main defect in aluminum alloy castings, which is also thought to be severe in aluminum alloy castings produced by lost foam process due to the pyrolysis of the polystyrene foam pattern during pouring. Fundamental experiments were carried out to evaluate the effect of process parameters such as the melt treatment, the cooling rate and the density of expanded polystyrene (EPS) foam on porosity in A356.2 bar casting. The effect of melt treatment including degassing and refining was investigated. The effect of cooling rate was also evaluated by changing the mold packing material such as the silica sand, the zircon sand and the steel shots. Gas entrapment due to the turbulent metal flow during mold filling in conventional molding process results in porosity. Mold filling sequence in lost foam process is different from that in conventional molding process. The effect of molten metal flow was estimated by comparing the density of the casting by conventional sodium silicate molding with that by lost foam process. Density measurement was conducted to analyze the extent of porosity in the casting. Source of the porosity in lost foam process can be divided into two factors, i.e. turbulence in molten metal flow and entraining residue or gas from the pattern during pouring. 展开更多
关键词 Lost foam process Mold packing material EPS foam POROSITY Melt treatment
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Improvement of controlled pollination techniques of poplar 被引量:3
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作者 ZHOU Zhong-cheng LIU Zong-you +3 位作者 HOU Kai-ju SUN Xian-meng ZHANG Ji-he SHEN Bao-xian 《Forestry Studies in China》 CAS 2008年第2期137-141,共5页
Over a number of years, in order to find substitutes for two traditional poplar pollination techniques: outdoor bridging trees and indoor cutting with water culture, research into two new pollination methods of uproo... Over a number of years, in order to find substitutes for two traditional poplar pollination techniques: outdoor bridging trees and indoor cutting with water culture, research into two new pollination methods of uprooted outdoor seed trees and outdoor cutting branches was carried out. The advantages of two new and improved techniques were of efficiency, economy, safety and ease of operation. The methods can be applied in hybridization and breeding of poplar and other easy-to-root trees. 展开更多
关键词 liquefied wood-based resin PLYWOOD molding material BIODEGRADABILITY
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Injection molding of ultra-fine Si_3N_4 powder for gas-pressure sintering 被引量:5
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作者 Xian-feng Yang Jiang-hong Yang +3 位作者 Xie-wen Xu Qi-cheng Liu Zhi-peng Xie Wei Liu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第6期654-659,共6页
The ceramic injection molding technique was used in the gas-pressure sintering of ultra-fine Si3N4 powder. The feedstock's flowability, debinding rate, defect evolution, and microstructural evolution during productio... The ceramic injection molding technique was used in the gas-pressure sintering of ultra-fine Si3N4 powder. The feedstock's flowability, debinding rate, defect evolution, and microstructural evolution during production were explored. The results show that the solid volume loading of less than 50vol% and the surfactant mass fraction of 6wt% result in a perfect flowability of feedstock; this feedstock is suitable for injection molding. When the debinding time is 8 h at 40°C, approximately 50% of the wax can be solvent debinded. Defects detected during the preparation are traced to improper injection parameters, mold design, debinding parameters, residual stress, or inhomogeneous composition distribution in the green body. The bulk density, Vickers hardness, and fracture toughness of the gas-pressure-sintered Si3N4 ceramic reach 3.2 g/cm^3, 16.5 GPa, and 7.2 MPa·m^1/2, respectively. 展开更多
关键词 ceramic materials silicon nitride injection molding sintering near net shaping
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Effect of Molding Material Temperature on Workpiece in FDM 被引量:1
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作者 PANG Xue-qin REN Chong HAN Lei-gang 《International Journal of Plant Engineering and Management》 2015年第3期170-178,共9页
Fused deposition molding is an advanced kind of rapid prototyping technology. On the accuracy of the forming process, the research on the temperature of the molding material is based on the analysis of the forming par... Fused deposition molding is an advanced kind of rapid prototyping technology. On the accuracy of the forming process, the research on the temperature of the molding material is based on the analysis of the forming parameters. The influence of the tenlperature of the molding material on the specimen is reasonably described by the actual forming part and the finite element analysis model. The experimental results show that the temperatur( of the molding material is less affected by the temperature of the molding material in a certain range. This will lay the theoretical foundation for the formation of the molding technology in the future 展开更多
关键词 rapid prototyping technology FDM process finite element analysis molding material temperature
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