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Elevated Temperature Strength of TiC_(p)/W Composites

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Journal of Materials Science & Technology 2001年第1期17卷 31-32页

作者： Yujin WANG Yu ZHOU Guiming SONG tingquan lei School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

The elevated temperature mechanical properties of TiCp,/W composites produced using powder metallurgical technique were investigated. Results show that with increasing temperature, the strength of TiCp/W composites increases gradually and reaches its maximum value at 1000℃, which is much higher than that at room temperature. The strengthening mechanisms at high temperature are attributed to dislocation strengthening and load transfer between matrix and particles.

关键词： dislocation strengthening mechanical properties elevated temperature room temperature high temperature maximum value load transfer strength of

Effect of Preparation Methods on Hydriding Properties of La1.5Mg17 Ni0.5 Composite Materials

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Journal of Rare Earths 2004年第Z2期22卷 110-113页

作者： Jiang Lijun Xiao Fang Li Qian Lin Qin Zhan Feng Chou Kouchih lei tingquan General Research Institute for Non-Ferrous Metal Beijing 100088China Department of Material Science and Engineering Harbin Institute of TechnologyHarbin 150001China General Research Institute for Non-Ferrous MetalBeijing 100088China Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing 100083China Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing 100083China General Research Institute for Non-Ferrous MetalBeijing 100088China Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing 100083China Department of Material Science and EngineeringHarbin Institute of TechnologyHarbin 150001China

La1.5Mg17Ni0.5 hydrogen storage materials were prepared by hydriding combustion synthesis (HCS) and mechanical alloying (MA) method respectively. The experimental results show that the hydrogen absorption properties of La1.5Mg17Nio.5 prepared by MA are better than that by HCS. La1.5Mg17Nio.5 prepared by MA can absorb 6.73 mass% hydrogen at 523 K within 1 min, and 4.92 mass% hydrogen at 423 K. The improvement of hydriding properties of La1.5Mg17Ni0.5alloy prepared by MA can be ascribed to the formation of nano-crystalline and defects during the mechanical alloying.

关键词： hydriding combustion synthesis mechanical alloying hydrogen storage material hydriding property

Preparation and Characterization of BAS Reinforced with SiC Platelets

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Journal of Materials Science & Technology 2000年第5期16卷 481-485页

作者： Jiancun RAO+, Jiancheng GU, Yu ZHOU, Feng YE and tingquan lei (Harbin Institute of Technology, Harbin 150001, China) Harbin Institute of Technology Harbin 150001 China

BAS glass-ceramic powders were prepared by sol-gel processing. SiC platelets reinforced BAS glass-ceramic matrix composites with high density and uniform microstructure could be made using hot-pressing method. The related processing parameters were studied in this work, including effects of additional seed on transformation from H to M of barium aluminosilicate. DTA method was used to determine exact time to press mixture powders during hot-pressing for the purpose of effective densification. Microstructure and mechanical properties of the composites were investigated by mean of SEM, XRD and TEM techniques as well as three points bending test and single edge notched beam measurement. The results showed that the flexural strength and fracture toughness value of the BAS glass-ceramic matrix composites could be effectively improved by the addition of the SiC platelets. But the relative densities of composites were slightly decreased. The main toughening mechanism is crack deflection, platelets' pull-out and bridging. The increased value of flexural strength is contributed to the load transition effect from matrix to SiC platelets.

关键词： BAS Preparation and Characterization of BAS Reinforced with SiC Platelets SiC

Synthesis and Ceramic Conversion of Polysiloxazane to Silicon Oxynitride

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Journal of Materials Science & Technology 2001年第1期17卷 3-4页

作者： Junbao ZHANG tingquan lei Guangwu WEN and Yu ZHOU School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China Sch. of Mater. Sci. Harbin Inst. of Technol. Harbin 150001 China

Amorphous silicon oxynitride powders have been obtained by pyrolysis of polysiloxazane in a stream of anhydrous NH3 at the temperature up to 1000℃. The polysiloxazane is fabricated from ammonolysis of chloropolysiloxane that is produced by the hydrolysis of silicon tetrachloride. The conversion of polysiloxazane to silicon oxynitride and the structural features of the final powders have also been studied by infrared spectra, elemental composition and X-ray diffraction analysis and SEM observation.

关键词： POLYMERIC PRECURSOR DICHLOROMETHYLSILANE NITRIDATION XEROGELS

Microstructure and Mechanical Properties of Si_3N_4 Composites Containing SiC Platelet

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Journal of Materials Science & Technology 1998年第2期14卷 151-155页

作者： Tao WEI Yu ZHOU tingquan lei and Yujin WANG (School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China) School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

Hoppressed Si3N4/SiC platelet composites had been investigated with respect to their microstructure and mechanical properties. The results indicate that Vickers hardness, elastic modulus and fracture toughness of the composites were increased by the addition of SiC platelet until the content up to 20 vol pct. A slight decrease in flexural Strength was measured at room temperature with increasing SiC platelet content. The high temperature flexural strength tests at 1150, 1250, and 1350℃ were conducted. It was found that the flexural strength at elevated temperature was degraded with the rising temperature, and the downward trend of flexural strength for the composite containing 10 vol. pct SiC platelet was less. The results indicate that SiC platelet had a positive influence on the high temperature strength. Effects of SiC platelet reinforcement were presented

关键词： SiC Microstructure and Mechanical Properties of Si3N4 Composites Containing SiC Platelet MPa

TENSILE FRACURE IN AN Al-Li ALLOY 8090

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中国有色金属学会会刊：英文版 1995年第2期5卷 106-108页

作者： Jiang, Daming Wang,Yinong Hong, Bande lei, tingquan(Harbin Institute of Technology, Harbin 150080)Sun Fenglian(Harbin University of Science and Technology, Harbin 150001) Harbin Inst of Technology Harbin China

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关键词： Al-Li alloy tensile fracture dimple rupture cleavage

Comparison of K_(IC) Values for SiC Whisker Reinforced Ceramic Composites Obtained by Using Various Methods

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Journal of Materials Science & Technology 1994年第5期10卷 331-340页

作者： tingquan lei Guangyong LIN Shuangxi WANG and Yu ZHOU (Dept. of Metals and Technology, Harbin Institute of Technology, Harbin, 150001, China)(To whom correspondence should be addressed) Harbin Inst of Technology Harbin China

The fracture toughness (KIC) values determined by indentation microfracture method (IM ) for SiC whisker reinforced Al2O3 and ZrO2 based composites were calculated with different IM equations and compared with those obtained by singte edge notched beam (SENB) technique. Experimental results show that the KIC (IM) values calculated with different equations are quite different one from another. For composites without phase transformable components the KIC (IM) and KIC (SENB) values are practically on the same level, but for composites with phase transformable components (partially stabilized zirconia) the KIC (SENB) values are always higher than KIC (IM). This is because that the IM method can not reveal sensitively the toughening effect due to dynamic t-m transformation of ZrO2 as the SENB method does. The accuracy of the IM method depends on the Suitability of the IM equations and was evaluated for the materials used in this investigation. Two new IM equations are suggested with which the KIC (IM ) values can be obtained very close to KIC (SENB) values for composites having phase transformable components.

关键词： SiC Values for SiC Whisker Reinforced Ceramic Composites Obtained by Using Various Methods Comparison of K IC

FRACTURE BEHAVIOUR OF SiC WHISKER REINFORCED Al COMPOSITES

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Acta Metallurgica Sinica(English Letters) 1989年第12期2卷 403-408页

作者： CAO Li JIANG Chiping YAO Zhongkai lei tingquan Harbin Institute of Technology,Harbin,China

The dynamic tensile processes of silicon carbide whisker reinforced Al composite(SiC_w/Al) with 22% V_f have been in situ observed with a scanning electron microscope equipped with a tensile *** results show that a number of microcracks have formed as the tensile stress increases to 180～190 *** form in most cases at the whisker *** frac- ture behaviour of SiC_w/Al composite observed has been explained theoretically.

关键词： composite fracture stress distribution SiC whiskers aluminum

Variations of Microstructure and Mechanical Properties of Si-B-O-N Ceramics with Sintering Temperatures

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Journal of Materials Science & Technology 2002年第4期18卷 343-346页

作者： Junbao ZHANG, Guangwu WEN, tingquan lei, Dechang JIA and Jiancun RAOSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

Si-B-O-N powder without B-O bonds synthesized by polymeric precursor were hot-pressed into ceramics at different tempera-tures. The variations of microstructure and mechanical properties of Si-B-O-N ceramics have been investigated. Crystallization of Si-B-O-N ceramics occurred at about 1400癈. Density, elastic modulus, and flexural strength of the ceramics increased with the increasing sintering temperatures, and reached to their maximum values at 1600癈. By contrast, hardness and frac-ture toughness of the ceramics monotonically changed with increasing sintering temperatures. Hardness decreased, while the fracture toughness increased. The principal toughening mechanisms including crack deflection, crack bridging and plate grain pulling-out effects are discussed

关键词： Si-B-O-N ceramics Microstructure. Mechanical properties toughening mechanisms