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Properties of Zirconia Material as Oxygen Sensor
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作者 林振汉 张玲秀 《Rare Metals》 SCIE EI CAS CSCD 1992年第3期212-216,共5页
The properties and applications of ZrO_2-Y_2O_3 material used as oxygen sensor were studied.Oxygen sensors are studied by X-ray diffraction technique,microstructure determination and thermal shock resistance test,and ... The properties and applications of ZrO_2-Y_2O_3 material used as oxygen sensor were studied.Oxygen sensors are studied by X-ray diffraction technique,microstructure determination and thermal shock resistance test,and are tested on the spot.Oxygen sensors made from the sintered dense ZrO_2 stabilized by Y_2O_3 can be used to measure the oxygen concentration in molten steel at 1600℃.The data obtained are stable and reliable, and the thermal shock resistance is high.The oxygen concentration is measured at(1~150)×10^(-4)% with re- sponse time of 2~3s. 展开更多
关键词 Oxygen sensor Response time Critical temperature Electrostatic interference Thermal shock resistance Micro-hardness
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Evaluation of Mechanical Properties of Medium Carbon Steel Quenched in Water and Oil
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作者 J. K. Odusote T. K. Ajiboye A. B. Rabiu 《Journal of Minerals and Materials Characterization and Engineering》 2012年第9期859-862,共4页
Samples of medium carbon steel were examined after heating between 900℃ - 980℃ and soaked for 45 minutes in a muffle furnace before quenching in palm oil and water separately. The mechanical behavior of the samples ... Samples of medium carbon steel were examined after heating between 900℃ - 980℃ and soaked for 45 minutes in a muffle furnace before quenching in palm oil and water separately. The mechanical behavior of the samples was investigated using universal tensile testing machine for tensile test and Vickers pyramid method for hardness testing. The microstructure of the quenched samples was studied using optical microscope. The tensile strength and hardness values of the quenched samples were relatively higher than those of the ascast samples, suggesting improved mechanical properties. However, samples quenched in palm oil displayed better properties compared with that of water-quenched samples. This behavior was traced to the fact that the carbon particles in palm oil quenched samples were more uniform and evenly distributed, indicating the formation of more pearlite structure, than those quenched in water and the as-received samples. 展开更多
关键词 MEDIUM Carbon Steel Muffle FURNACE QUENCHING Media TENSILE Strength HARDNESS VALUE
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Effect of Sulfur Precursor on Dimensions of One-dimensional CdS Nanocrystals 被引量:1
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作者 M.Maleki Sh.Mirdamadi +1 位作者 R.Ghasemzadeh M.Sasani Ghamsari 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2009年第4期462-464,共3页
One-dimensional CdS nanocrystals have been prepared by solvothermal method using cadmium acetate as a cadmium precursor, elemental sulfur and Na2S, as a sulfur precursor, and ethylenediamine as a solvent at 150℃ for ... One-dimensional CdS nanocrystals have been prepared by solvothermal method using cadmium acetate as a cadmium precursor, elemental sulfur and Na2S, as a sulfur precursor, and ethylenediamine as a solvent at 150℃ for 5 h. The nanocrystals were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and UV-Vis absorption spectroscopy. XRD patterns indicate that both Na2S and elemental sulfur as the sulfur precursor result in CdS nanorods with wutzite phase (hexagonal structure). SEM and TEM images show that diameter of CdS nanorods can be decreased using Na2S instead of elemental sulfur. For the growth of CdS nanorods, a mechanism has been proposed. Uv-Vis absorption of CdS nanorods (sulfur precursor: Na2S) was shown blue shift to 485 nm due to the quantum size effect. 展开更多
关键词 NANOMATERIALS SEMICONDUCTORS CdS nanorods Na2S Solvothermal method
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Effect of heat treatments on failure mechanism of SiC_p/2124 Al composite 被引量:1
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作者 M.Murato■ lu 《中国有色金属学会会刊:英文版》 EI CSCD 2005年第4期839-845,共7页
The mechanical response of a 17%(volume fraction) silicon carbide particles reinforced 2124 Al composite prepared by powder metallurgy techniques was studied by altering the matrix strength with different heat treatme... The mechanical response of a 17%(volume fraction) silicon carbide particles reinforced 2124 Al composite prepared by powder metallurgy techniques was studied by altering the matrix strength with different heat treatments. The fracture mechanisms and the deformation microstructure were examined by scanning electron microscopy. The results show that matrix strength appears to play an important role in influcing the behaviour of the composite under hardness and tensile loading conditions and also fracture mechanisms.The high matrix strength results in a larger decrease in yield strength due to the increasing damage probability. The tensile yield strength values decrease under peak aged and overaged condition whereas under the solutinized condition the opposite effect can be seen. 展开更多
关键词 有色金属 热处理 表面裂纹 微结构
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Effect of the Density to the Electrical Conductivity of Carbon-Carbon Composite Made of the Mixture of Organic Waste Carbon 被引量:1
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作者 Agus Edy Pramono Anne Zulfia Johny Wahyuadi Soedarsono 《材料科学与工程(中英文A版)》 2012年第5期402-409,共8页
关键词 碳复合材料 混合物 导电性 有机废弃物 密度 电导率值 煤焦油沥青 混合煤
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Effect of External Forced Flow and Boiling Film on Heat Transfer of AISI 4140 Steel Horizontal Rod During Direct Quenching 被引量:1
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作者 A H Meysami R Ghasemzadeh +1 位作者 S H Seyedein M R Aboutalebi 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2011年第10期34-41,共8页
The effects of rod falling and moving, external flow field, boiling film and radiation were investigated on fluid flow and heat transfer of AISI 4140 steel horizontal rod during direct quenching by mathematical modeli... The effects of rod falling and moving, external flow field, boiling film and radiation were investigated on fluid flow and heat transfer of AISI 4140 steel horizontal rod during direct quenching by mathematical modeling. The flow field and heat transfer in quenching tank were simulated by computational fluid dynamics (CFD) method considering falling and moving of rods during process. Therefore, modeling of flow field was done by a fixed-mesh method for general moving objects equations, and then, energy equation was solved with a numerical approach so that effeet of boiling film heat flux was considered as a source term in energy equation for solid-liquid boundary. Simulated results were verified by comparing with published and experimental data and there was a good agreement between them. Also, the effects of external forced flow and film boiling were investigated on heat flux output, temperature distribution and heat transfer coefficient of rod. Also simulated results determined optimum quenching time for this process. 展开更多
关键词 direct quenching AISI 4140 moving object heat transfer modeling
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