Study of Thick Tungsten Coatings Deposited on the Different Substrates

摘要

Thick pure tungsten coatings were deposited on molybdenumand copper substrate by vacuum plasma spray for differentpurpose. The microstructures of tungsten coatings wereinvestigated by X-ray diffraction (XRD) and scanning electronmicroscopy (SEM). The effect of preheating temperature ofthe substrate and introduction of gradient bond layer on theadhesive strength of the coating was investigated. High heatload was tested by high power electron beam bombardmentonly for tungsten coating on copper. All the results show thatthe properties of tungsten coating were strongly influenced bydifferent processes, and the density of the coatings is close to95% of theory density.