Abstract
Purpose - This paper investigated the plasma characteristics of laser micro sintering Cu-based metal powder using spectra method.Design/methodology/approach - Temporal and time integrating plasma induced during laser micro sintering Cu-based metal powder with a Q-switched pulsed YAG laser have been detected and analyzed. Boltzmann plot and Stark broadening of the spectra line are utilized to analyze the electron temperature and density, respectively. The influences of the Q-switching rate and duration on the plasma temperature and electron density have been investigated.Findings - The results show that the plasma temperature decreases from 9600K to 9000K with the increase of the Q-switching rate from 5kHz to 35kHz if Q-switching duration of laser is kept at a constant value. The plots of temporal temperature and electron density show that the electron density varies in a faster speed than plasma temperature and the entire expansion process takes about 700ns-1us in this experiment. Evolutional images of the plasma plume using Q-switching rate of 5kHz and 5?s have been registered by the ICCD with a 10ns exposure time, which shows that the plasma plume takes about 100ns to get to the maximum size and 600ns to disperse.Originality/value - The plasma spectra of laser micro sintering Cu-based metal powder has been diagnosed experimentally. The plasma characteristics of laser micro sintering Cu-based metal powder have been analyzed.
Purpose - This paper investigated the plasma characteristics of laser micro sintering Cu-based metal powder using spectra method.Design/methodology/approach - Temporal and time integrating plasma induced during laser micro sintering Cu-based metal powder with a Q-switched pulsed YAG laser have been detected and analyzed. Boltzmann plot and Stark broadening of the spectra line are utilized to analyze the electron temperature and density, respectively. The influences of the Q-switching rate and duration on the plasma temperature and electron density have been investigated.Findings - The results show that the plasma temperature decreases from 9600K to 9000K with the increase of the Q-switching rate from 5kHz to 35kHz if Q-switching duration of laser is kept at a constant value. The plots of temporal temperature and electron density show that the electron density varies in a faster speed than plasma temperature and the entire expansion process takes about 700ns-1us in this experiment. Evolutional images of the plasma plume using Q-switching rate of 5kHz and 5?s have been registered by the ICCD with a 10ns exposure time, which shows that the plasma plume takes about 100ns to get to the maximum size and 600ns to disperse.Originality/value - The plasma spectra of laser micro sintering Cu-based metal powder has been diagnosed experimentally. The plasma characteristics of laser micro sintering Cu-based metal powder have been analyzed.