The bulk B-doped polycrystalline diamond (PCD) electrode in this study was prepared by high-pressure, high-temperature (HPHT) technology. The PCD was sintered under HPHT conditions, using B-doped diamond powders and a metal catalyst as raw materials, then the metal solvent phase was dissolved by aqua regia. The morphology and composition of the PCD were investigated with a scanning electron microscope (SEM), X-ray diffraction (XRD), and energy dispersion spectrum (EDS). The results show that the sintered body possesses a polycrystalline structure with direct diamond-diamond bond and irregularly shaped pores of 1-10 lm distributed on the grain boundaries after the metal solvent phase was removed. The cyclic voltammogram and electrochemical impedance spectroscopy of this B-doped electrode have been investigated. The B-doped PCD electrode exhibits stable electrochemistry in a KCl support solution over a wide potential range. The quasi-reversible reaction occurs on the electrode for the [Fe(CN) 6 ] 3-/4-couples. The electrode process combines the diffusion-controlled mass transport plus the kinetic process. The electrochemical impedance spectroscopy (EIS) analysis shows the porous structure characteristic of the PCD electrode.
This study aimed to prepare a composite bar by thermal simulation experiment mechanism considering 316L/EH40 composite with Fe-Co-Ni interlayer as the research object. First, the barrier property of the Fe-Co-Ni interlayer was verified. Then, the effects of coating temperature, interlayer vacuum degree, and mold temperature on the coating ratio of Fe-Co-Ni interlayers, melt solidification characteristics, and shrinkage cavity were analyzed using the ProCAST simulation software. The results showed that an appropriate increase in the coating temperature could effectively improve the coating ratio and reduce the shrinkage cavity. The interlaminar vacuum degree increased the interlaminar coating ratio and reduced the shrinkage cavity; however, the shrinkage cavity rate increased when the interlaminar vacuum degree was too high. Increasing the mold temperature promoted the coating ratio and reduced the shrinkage cavity. The area where the interlayer could be completely coated was significantly reduced with the decrease in the interlaminar thickness.
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