http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Bahman Nasiri-Tabrizi,Abbas Fahami,Reza Ebrahimi-Kahrizsangi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
In the present investigation the effects of milling parameters (time, atmosphere, and media) andchemical composition of raw materials on the mechanochemical synthesis of nanocrystallinehydroxyapatite (n-HAp) were studied. For a comparative study of the mechanically activated samplesversus thermally treated specimen (natural origin), n-HAp was also produced via annealing of bovinebone at 800℃ for 2 h. The gained powders exhibited average sizes about 32 and 27 nm under airatmosphere, and about 32 and 34 nm under argon atmosphere. TEM images confirmed the formation ofn-HAp with various morphologies under different experimental conditions.
Bahman Nasiri-Tabrizi,Abbas Fahami 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Poorly crystalline nano-sized tricalcium phosphate powders were successfully synthesized by two distinct mechanochemical reactions. Results revealed that the structural features as well as morphological characteristics were influenced by the chemical composition of reagents. The obtained nanopowders exhibited average sizes about 21 and 28 nm. According to the TEM/SEM observations, the synthesized powders showed cluster-like structures composed of spheroidal particles with a mean size of about 23 nm and ellipsoidal particles with an average size of about 30 nm. The proposed method as a new vision in powder technology can be used for mass production of nanostructured tricalcium phosphates.
Crystallization behavior of tantalum and chlorine co-substituted hydroxyapatite nanopowders
Bahman Nasiri-Tabrizi,Belinda Pingguan-Murphy,Wan Jefrey Basirun,Saeid Baradaran 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
The crystallization behavior of tantalum and chlorine co-substituted hydroxyapatite nanopowders wasexamined. Results showed that combined processing by mechanical alloying and annealing is conduciveto the structural changes and crystal growth. A series of nanocrystalline tantalum and chlorine cosubstitutedhydroxyapatite (Ta/Cl–HA) with different dopant contents were synthesized as a result ofthe progressive mechanochemical reaction. During the subsequent annealing, crystallization of the asmilledpowders occurred, leading to a significant increase in the fraction of crystalline phase. TEMimages revealed that the crystallized and doped nanopowders composed of crystalline nanoneedles withan average size of 61 26 nm.
Mohsen Mesbah,Firouz Fadaeifard3,Atefeh Karimzadeh,Bahman Nasiri-Tabrizi,Alireza Rafieerad,Ghader Faraji,A. R. Bushroa 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.6
The production of the ultrafine-grained brass tubes was carried out by multi-pass parallel tubular channelangular pressing (PTCAP) as a severe plastic deformation process. In addition to that, the microstructuraland nano-mechanical features were investigated by EBSD and Nanoindentation for 0, 1, and 3 passes in acomparable mode. The elastic-plastic and micro scratch behavior were analyzed to show the enhanced features. Based on the obtained results, Young’s modulus and hardness of the specimens shifted to 1.62 and 1.7 times ofthe coarse-grained counterpart after the third pass respectively. The effects of the number of passes on the grainrefinement were also investigated to detect the applied changes through each step of the PTCAP experimental procedures. Moreover, based on the obtained results from EBSD, the grain size of 1 and 3 pass samples wererefined to 780 and 590 nm from its initial size of 75 μm. The fraction of the high-angle grain boundarieswas increased from 30% in pass 1 to 66% in pass 3 of the PTCAP process.