Adhesion of CVD tin on 316l surgical stainless steel obtained in a mass transfer regime

Abstract

An investigation has been undertaken to study the adhesion of TiN coatings deposited by using the CVD process at 900~ on surgical stainless steel. The microscratch test method (CSEM) was employed to evaluate the coating adhesion. Three scratches were performed at progressive load under the test conditions. The observation of the surface damage by means of an optical microscope allowed the determination of the critical load, defined as the smallest load at which some recognizable adhesive failure event occurs. No acoustic emission detections or frictional force fluctuations could be correlated with the optical observations. An estimate of the work of adhesion was evaluated by using different models presented in the literature and a satisfactory description of the experimental data was obtained by means of the Bull et al. model which indicated a value ofW = 4 J.m -2. The failure criterion is then correlated with the detailed information obtained by using microscopic observation of the coatings along the scratch channel.

Quantitative investigation of the adhesion strength between an SU‐8 photoresist and a metal substrate by scratch tests

“…Burnett and Rickerby 18,19 considered the elastic and plastic deformations around the indenter. On the basis of their investigation, Attar and Johannesson 20 and Staia et al 21 established the relationship between the critical load and W. However, their model only adapts to the case of small coefficient of friction.…”