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Zhang C.,Xihua University | Yuan Q.,Xihua University | Wang Q.,Xihua University | Sheng Z.,Xihua University | Wang L.,Zhongshan Torch Polytechnic College
Advanced Materials Research | Year: 2011

The W-Ti-Co powders was doped different content of TaC with an average particle size of 270nm were prepared by 72 hours high-energy ball milling. The powder was cold isostatic pressed and vacuum sintered at 1380°C. The physical properties and the micrographs of samples were detected. The main conclusions were as follow: the density and Cobalt magnetic decreased with the content of TaC increasing, the coercivity increased at first and then decreased, the coercivity of alloy with 0.6wt.% TaC was higher than the other. When the content of TaC was less than 0.6wt.%, the hardness increased with the content of TaC increasing.While when the content of TaC was more than 0.6wt.%, the hardness decreased obviously. Comparing with the alloy without TaC doped, the transverse rupture strength (TRS) of the alloy with 0.4wt.%TaC increased to a larger extent. When the content of TaC was more than 0.4wt.%, the transverse rupture strength (TRS) decreased with the content of TaC increasing. The TaC could inhibit the grain growth, and the comprehensive performance of the alloy with 0.4wt.% TaC was best. © (2011) Trans Tech Publications, Switzerland. Source


Yang M.-X.,Jinan University | Yang M.-X.,Zhongshan Torch Polytechnic College | Liang Y.-G.,UNO Scientific Co. | Chen H.-R.,Jinan University | And 3 more authors.
Chinese Traditional and Herbal Drugs | Year: 2014

Objective: To investigate the chemical constituents from the leaves of wild Aquilaria sinensis. Methods: The powder of the dried leaves was percolated with 70% acetone. Various chromatographic methods were employed to isolate the compounds and their structures were established by spectroscopic analysis. Results: Thirteen compounds were isolated and identified as 6-E-octadecenoic acid (1), ethyl linoleate (2), apiolin-7, 4'-dimethyl ether (3), 4-cyanobenzaldehyde (4), luteolin-7, 3', 4'-trimethyl ether (5), genkwanin (6), p-phthalic acid di (4-octyl) ester (7), 6-hydroxy-7, 4'-dimethoxyflavone (8), 5-hydroxy-7, 2', 4', 5'- tetramethoxyflavone (9), 5, 4'-dihydroxy-7, 3'-dimethoxyflavone (10), quercetin (11), kaempferol (12), and 4-hydroxybenzoic acid (13). Conclusion: Thirteen compounds have been identified from wild A. sinensis leaves. Compounds 4, 8, and 9 are firstly isolated from the plants of Thymelaeaceae. Source


Zhang C.,Xihua University | Yi X.,Xihua University | Yuan Q.,Xihua University | Wang L.,Zhongshan Torch Polytechnic College
Advanced Materials Research | Year: 2012

Three groups of GCr15 steel were heat-treated respectively by conventional spheroidizing annealing, circulation spheroidizing annealing, 1050°C for 30min oil cooling quenching + 700°C tempering. The final heat treatment of these GCr15 steel was 840°C oil cooling quenching + 150°C tempering. The microstructure of the heat-treated GCr15 were observed and the mechanism of three spheroidizing treatment were discussed in this paper. The results showed that: There is obvious difference among the three groups carbide of GCr15 for the mechanism of three spheroidizing treatments is different. The GCr15 has 1050°C for 30min oil cooling quenching + 700°C tempering showed the best result of carbide spheroidizing. The microstructure of GCr15 after 840°C oil cooling quenching + 150°C tempering was tempered martensite and carbide which is fine, round and widely distributed. © (2012) Trans Tech Publications. Source


Zhang C.,Xihua University | Wang Q.,Xihua University | Yuan Q.,Xihua University | Wang L.,Zhongshan Torch Polytechnic College
Advanced Materials Research | Year: 2012

In this paper, the WC-16TiC-xTaC-10Co mixture mixed by WC 0.52μm, (W, Ti, Ta)C 2.9μm and Co1.36μm and prepared by high-energy ball milling, changed the VC and Cr 3C 2 adding amount. After ball milling for 60 hours, an average particle size of 220nm powder was prepared and it was cold isostatic pressed at 300MPa and vacuum sintered at 1410°C. The physical properties and the micrographs of samples were detected. The main conclusions are as follow: the coercivity and hardness increase and Cobalt magnetic decreases with the content of Cr 3C 2 increasing, the transverse rupture strength (TRS) does not vary. The VC and Cr 3C 2 inhibit the growth of WC grain, but can't inhibite the (W, Ti, Ta)C grain growth effectively. © (2012) Trans Tech Publications. Source

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