Effect of irradiation pulses on the microstructure and phase composition of a NiCoCrAlY laser cladding coating under the action of a high-current pulsed electron beam.

To reduce the number of microcracks and pores on the surface of laser cladding layers, we used a novel, to the best of our knowledge, surface alloying method to modify the surface of a NiCoCrAlY laser cladding coating using high-current pulsed electron beam technology. The x-ray diffraction peaks of the irradiated coatings were affected by the residual stress, which caused the peaks to shift and significantly broaden. With an increase in the number of pulses, the cleaning effect of the coating surface became significant.

The deposition of VWO on the CuCeO microflower for the selective catalytic reduction of NO with NH at low temperatures.

NO emissions are a major environmental problem, and the selective catalytic reduction (SCR) is the most effective method to convert NO in flue gas into harmless N and HO. In this work, a new carrier, CuCeO microflower assembled from a large number of copper-cerium mixed oxide nanosheets, is firstly developed to load vanadium-tungsten mixed oxides (VWO) for the SCR of NO with NH. The resultant optimal VWO/CuCeO catalyst exhibits significantly enhanced low-temperature de-NO performance with the NO conversion of 60% at 180 °C, over 90% from 240 °C to 390 °C under the gas hourly space velocity (GHSV) of 36,000 h.