However,the growth of particle velocity facilitated the particle impact
breakage, minified splats, increased splat flattening ratio and adhesion
among splats to suppress interlamellar shrinkage porosity formation,
and consequently, diminished the coating porosity. Under the present
experimental conditions, the latter effect may overwhelm the former,
thereby causing the coating porosity to decrease with increasing the
HVOF energy, so HF2 had a lower porosity than HF1.
However,the growth of particle velocity facilitated the particle impact
breakage, minified splats, increased splat flattening ratio and adhesion
among splats to suppress interlamellar shrinkage porosity formation,
and consequently, diminished the coating porosity. Under the present
experimental conditions, the latter effect may overwhelm the former,
thereby causing the coating porosity to decrease with increasing the
HVOF energy, so HF2 had a lower porosity than HF1.
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