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Optical temperature sensing properties of Yb3+/Tm3+ co-doped NaLuF4 crystals
Lili Tong,Xiangping Li,Ruinian Hua,Lihong Cheng,Jiashi Sun,Jinsu Zhang,Sai Xu,Hui Zheng,Yanqiu Zhang,Baojiu Chen 한국물리학회 2017 Current Applied Physics Vol.17 No.7
Yb3þ/Tm3þ and Yb3þ/Er3þ co-doped NaLuF4 crystals were synthesized by a facile hydrothermal method. The optical temperature sensing properties of Tm3þ based upon its two thermally coupled energy levels 3F2, 3 and 3H4 were systematically investigated by means of fluorescence intensity ratio (FIR) technique. The 980 nm laser-induced thermal effect on Tm3þ doped NaLuF4 crystals was studied by using Er3þ doped sample as thermal probe. The temperature sensitivity of Tm3þ in NaLuF4: Yb3þ/Tm3þ crystals shows a nonlinear dependence on temperature, and the maximum value is about 0.00045 K『1 at 600 K. The accuracy and reliability of the optical thermometry based on Tm3þ in NaLuF4: Yb3þ/Tm3þ crystals has been checked by using Yb3þ/Er3þ co-doped sample as temperature sensing unit. The results demonstrate that NaLuF4: Yb3þ/Tm3þ crystals have good sensing stability and may have potential application for the optical thermometry.
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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.
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