EVALUATION OF SURFACE ROUGHNESS OF NICKEL CHROMIUM CASTING USING VARIOUS ABRASIVE POWDERS

Prof (Dr) Krishna Prasad D; Prof (Dr) Chethan Hegde; Dr Vignesh Kamath

Volume : VI, Issue : V, May - 2017

EVALUATION OF SURFACE ROUGHNESS OF NICKEL CHROMIUM CASTING USING VARIOUS ABRASIVE POWDERS

Prof Dr Krishna Prasad D, Prof Dr Chethan Hegde, Dr Vignesh Kamath

Abstract :

Purpose: A study was carried out to evaluate the surface roughness of nickel chromium castings before and after sandblasting with various aasive powders. Methodology: A total of 30 samples made of nickel chromium were categorised into Group I, Group II and Group III based on aasive powder used for sandblasting which where aluminium oxide, glass beads and 1:1 mixture of aluminium oxide and glass beads respectively. The surface roughness was measured before and after sandblasting for all the samples using profilometer. One sample before sandblasting and one sample from each group after sandblasting was subjected to scanning electron microscopic study and Energy Dispersive X–Ray Spectroscopy analysis. Results: Statistical comparison of the mean surface roughness between the groups before and after sandblasting was done. Conclusion: Within the limitation of the study it is concluded that use of aasive powders has an effect on the surface roughness of the Nickel Chromium castings. Therefore, careful consideration must be done on the type of aasive powders selected for the good finishing of the final restoration.