2results about How to "Consistent workmanship" patented technology

The invention discloses a strong-acid-corrosion-resistant carbon-loaded platinoid all-alloy nano material and a preparation method thereof, and relates to the technical field of new energy materials. The preparation method of the carbon-loaded platinoid all-alloy nano material comprises the following steps: dispersing a carbon carrier in a solvent, adding platinum and copper precursors, dispersing, and adsorbing at constant temperature to obtain a suspension mixed solution; drying by distillation, drying and grinding to obtain a solid compound; calcining in an inert atmosphere, and cooling to obtain a carbon-supported platinoid material; and carrying out strong acid corrosion treatment, washing, drying and grinding to obtain the strong acid corrosion resistant carbon-loaded platinoid all-alloy nano material. The prepared material can keep the crystal structure stable in a strong acid environment and has excellent acid corrosion resistance, and the platinum-copper nano material takes platinum as a solvent and copper as a solute to form a complete alloy phase with the atomic ratio of copper to platinum being greater than or equal to 1: 1. When the material is used as an oxygen reduction catalyst, the atom utilization rate of platinum is high, and meanwhile, the oxygen reduction reaction catalytic activity and long-term stability of the material are remarkably improved.

The silicon carbide fiber wear resistance testing device comprises an unwinding mechanism, grinding roller sets, a guide ring set and a winding mechanism, the grinding roller sets comprise the first grinding roller set and the second grinding roller set, the first grinding roller set is arranged between the unwinding mechanism and the guide ring set, and the second grinding roller set is arranged between the guide ring set and the winding mechanism; the guide ring set comprises a first-stage guide ring, a second-stage guide ring, a third-stage guide ring, a fourth-stage guide ring and a tension adjusting mechanism, the first-stage guide ring and the second-stage guide ring are obliquely arranged to form a guide-in ring set, the fourth-stage guide ring and the third-stage guide ring are obliquely arranged to form a guide-out ring set, and the guide-in ring set and the guide-out ring set are arranged in a front-back staggered mode in the vertical plane direction. The tension adjusting mechanism is arranged between the leading-in ring set and the leading-out ring set. Compared with the prior art, through the special friction pair design of the grinding roller and the guide ring group, the tension grading control and the multi-section friction path simulation, the test cost is reduced, the detection efficiency is improved, and the real friction scene of the silicon carbide fiber weaving process is comprehensively adapted.