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Electrochemical Behavior of a Vacuum-Brazed 10Ni-WC/NiCrBSi Composite Coating
Zhu Jiawei,Zou Jiasheng,Qiao Yanxin,Wang Yi,Xu Xiangping 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.11
In this work, a 10Ni-WC/NiCrBSi composite coating was fabricated on a Q235 substrate by using vacuum brazing. The bonding strength, surface hardness and corrosion behavior of the coating were characterized by using shearing, a Vickers hardness test and an electrochemical measurement. The results showed that the bonding strength was 365.1 MPa and that the surface hardness of the coating reached nearly 2500 HV, which was ten times that of the Q235 substrate. The corrosion trend of the coating was analyzed by electrochemical impedance spectroscopy and potentiodynamic polarization curves. The results showed that the electrochemical system of the coating was a charge-transfer control system with a passive behavior. Combined corrosion micro-morphology and the energy dispersive X-ray spectroscopy (EDS) showed that the 10Ni-WC/NiCrBSi composite coating had superior corrosion resistance, but the pitting corrosion resistance of the coating was poor. In addition, after corrosion, the hard phase particles inside the coating were shown not to fail. The corrosion resistance of the vacuum-cladded 10Ni-WC/NiCrBSi coating was obtained.
Effect of Laser Power on Hybrid Laser-Gas Metal Arc Welding (GMAW) of a 6061 Aluminum Alloy
Zhou Huiling,Fu Fanglian,Dai Zhixin,Qiao Yanxin,Chen Jian,Yang Lanlan,Liu Wen 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.11
The effect of laser power on the geometrical characteristics, microstructure and micro-hardness of the welding joints for 6061 aluminum alloy after hybrid laser-gas metal arc welding (GMAW) was investigated. The results showed that the welding joints from "Bottom" to "Top" were mainly composed of planar crystals, columnar crystals, and equiaxed dendrites. With increasing laser power, the weld depth and width and the grain size increased. When the laser power reached 5 kW, pores could be found in the weld pool region. Micro-hardness measurements showed that the application of higher laser power hardly changed the hardness of the welding joint.
Comparison of Autogenous Tooth Materials and Other Bone Grafts
Zhang Shuxin,Li Xuehan,Qi Yanxin,Ma Xiaoqian,Qiao Shuzhan,Cai HongXin,Zhao Bing Cheng,Jiang Heng Bo,이의석 한국조직공학과 재생의학회 2021 조직공학과 재생의학 Vol.18 No.3
Autogenous odontogenic materials are a new, highly biocompatible option for jaw restoration. The inorganic component of autogenous teeth acts as a scaffold to maintain the volume and enable donor cell attachment and proliferation; the organic component contains various growth factors that promote bone reconstruction and repair. The composition of dentin is similar to that of bone, which can be a rationale for promoting bone reconstruction. Recent advances have been made in the field of autogenous odontogenic materials, and studies have confirmed their safety and feasibility after successful clinical application. Autogenous odontogenic materials have unique characteristics compared with other bone-repair materials, such as the conventional autogenous, allogeneic, xenogeneic, and alloplastic bone substitutes. To encourage further research into odontogenic bone grafts, we compared the composition, osteogenesis, and development of autogenous odontogenic materials with those of other bone grafts. In conclusion, odontogenic bone grafts should be classified as a novel bone substitute.
Erosion-corrosion behaviors of Z2CN19·10N austenitic stainless steel in liquid–solid two-phase flow
Wu Xiangfeng,Li Chengtao,Luo Kunjie,Fang Kewei,Qiao Yanxin 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.4
The erosion-corrosion behaviors of Z2CN19·10N austenitic stainless steel in a 3.5-wt% NaCl solution with various sediment contents (7 wt%, 10 wt%, 20 wt%) and flow rates (1 m/s, 3 m/s, 5 m/s) were studied using a rotary disk erosion-corrosion test device, scanning election microscopy (SEM), potentiodynamic polarization test and potentiostatic polarization test. The results showed that sediment concentration had a smaller influence on the electrochemical corrosion behavior of Z2CN19·10N stainless steel than the flow rate and that the flow rate mainly affected the pitting potential and passivation range, but it had little influence on the potential-constant polarization. When the erosion velocity was lower than 5 m/s, mechanical erosion was the main influencing factor, and no critical flow velocities appeared.