Effects of the impact angle variations on the erosion rate of glass in powder blasting process

Abstract

Sandblasting, a conventional technique which is used for paint or scale removing, deburring, and glass decorating, has recently been developed into a powder blasting technique for brittle materials capable of producing micro-structures larger than 100 lm. This article describes an investigation of the effects of the impact angle of particles, the scanning times, and the standoff distance on the surface roughness, the weight-loss rate of samples with no mask, and the wall profile and overetching of samples with different mask patterns in powder blasting of soda-lime glass. The parameters are the various impact angles between 50 and 90°, the scanning times of a nozzle up to 40, and the standoff distances between 70 and 100 mm. The widths of the mask pattern are 0.2 mm, 0.5 mm, and 1 mm. The powder used is Al2O3 sharp particles, WA#600. The mass flow rate of powder during the erosion test is constant at 175 g/min and the blasting pressure of the powder is 0.2 Mpa. After a series of necessary experiments are performed, the results are investigated and analysed. As a result, a fundamental basis is established that can be applied to powder blasting to produce micro-mechanical parts of glass.

A level set methodology for predicting the surface evolution of inclined masked micro-channels resulting from abrasive jet micro-machining at oblique incidence

“…mass of material removed per unit mass of erodent particle launched, at normal incidence (a¼901) [18]. PMMA, on the other hand, behaves in a ductile erosive manner, with a maximum erosion rate at shallow angles of attack [2,18]. The AJM process models that will be developed for these two materials are thus applicable to a wider class of ductile and brittle erosive systems by simply specifying different erosive system parameters.…”

“…When subjected to solid particle erosion, glass behaves in a typical brittle erosive manner, with a maximum erosion rate, i.e. mass of material removed per unit mass of erodent particle launched, at normal incidence (a¼901) [18]. PMMA, on the other hand, behaves in a ductile erosive manner, with a maximum erosion rate at shallow angles of attack [2,18].…”

“…The AJM of PMMA (Piedmont Plastics Inc., Brampton, ON, Canada, density r s ¼1190 kg m À 3 ) and borosilicate glass (Borofloat, Schott North America Inc., Elmsford, NY, USA, r s ¼2200 kg m À 3 ) was investigated because both are commonly utilized materials in microfluidics [4,18] and MEMS applications [5,19]. When subjected to solid particle erosion, glass behaves in a typical brittle erosive manner, with a maximum erosion rate, i.e.…”

“…Park et al [18] also studied the effect of under-etching in masked glass samples machined at oblique incidence, and schematically showed that mask wear and second-strike effects can have a significant effect on the resulting shape of the machined features.…”

Lanthanum zirconate based thermal barrier coatings: A review

“…Erosion models of brittle materials such as the top coat in TBC can be described using the indentation theory of abrasive particles, which focuses on the relationship between TBC's material properties (e.g., E and KIC) and the erosion process conditions (e.g., impact velocity and abrasive particle size) [66][67][68][69]. It is necessary to determine whether an impinging particle will initiate cracks in the target material.…”