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| Quantitative Analysis of Nickel-Based Superalloys Based on a Remote LIBS System |
| WANG Ya-wen1,2,3, ZHANG Yong4, CHEN Xiong-fei1,2,3, LIU Ying1,2,3, ZHAO Zhen-yang4, YE Ming-guo5, XU Yu-xing6, LIU Peng-yu1,2,3* |
1. National Analysis and Testing Center of Nonferrous Metals and Electronic Materials, Beijing 100088, China
2. China United Test & Certification Co., Ltd., Beijing 101400, China
3. General Research Institute for Nonferrous Metals, Beijing 100088, China
4. Shandong Dongyi Photoelectric Instruments Co., Ltd., Yantai 264670, China
5. Shandong Technology Transfer Center, CAS, Yantai 264003, China
6. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
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Abstract Based on the self-designed remote laser-induced breakdown spectroscopy (LIBS) system, the focusing characteristics of remote LIBS were analyzed, and the experimental method of quantitative analysis of nickel-base superalloy by remote LIBS was studied. In this LIBS system, the laser focusing and the plasma optical signal acquisition optical paths are coaxial and independently focused. Through automatic focusing, the remote analysis of 1~10 m can be achieved. The results show that affected by the depth of focus, the detectable range of plasma optical signal increases with the increase of working distance. That is, the requirement of the LIBS system for focusing accuracy decreases. At the same time, the decrease of power density caused by the increase of ablation spot size and the decrease of signal acquisition solid angle make the spectral line intensity attenuate in inverse proportion to the fourth power as the working distance increases. In this paper, the standard curves of Ni, Cr, Nb, Mo, Ti and Al in GH4169 nickel-based superalloy were established using the standard curve method without internal standard with internal standard. The goodness of fit of the standard curve with internal standard (0.999 7, 0.999 4, 0.999 87, 0.999 1, 0.998 1 and 0.999 7) was significantly better than that of the standard curve without internal standard (0.953 2, 0.876 6, 0.897 4, 0.914 5, 0.938 4 and 0.991 6). Finally, LIBS and XRF were compared. For major elements Ni, Cr, Nb and Mo, the relative standard deviations of the two methods were 1.75%~3.90% and 0.10%~0.52%, and the relative errors were 0.48%~0.92% and 0.64%~2.25%, respectively; for trace elements Ti and al, the relative standard deviations of the two methods were 5.58%, 5.86% and 2.39%, 5.64%, the relative error is 2.75%, 3.14% and 4.68%, 2.39% respectively. Due to the instability of plasma, the precision of the remote LIBS method is slightly lower than that of the XRF method. However, LIBS method can effectively reduce the measurement error through repeated measurements, which indicates that LIBS technology is feasible for remote on-line analysis of nickel-based superalloys.
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Received: 2021-01-06
Accepted: 2021-02-01
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Corresponding Authors:
LIU Peng-yu
E-mail: liupengyu@cutc.net
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