The microhardness and abrasive wear resistance of cast Al-Si alloys after plasma-electrolytic oxidation (PEO) in a weakly alkaline basic electrolyte (3 g/L KOH + 2 Na2SiO3), as well with the addition H2O2, were determined. X-ray analysis showed that PEO layer comprises two oxide phases, namely α-Al2O3 γ-Al2O3, sillimanite -Al2O3 · SiO2 small percentage mullite -3 Al2O3 2SiO2. Silicon is present...

The emergence of ultrasonic vibration–assisted polishing technology has effectively improved the machining accuracy and efficiency hard brittle materials in modern optical industry; however, material removal mechanism (UVAP) still needs to be further revealed. This paper focuses on glass (BK7), application axial vibration, atomization slurry; model was established. Based analysis relationship b...

Micro-sized Al2O3-modified carbon fiber hybrid reinforced polymer composites (CFHRP) were prepared using the vacuum-assisted resin transfer molding (VARTM) process, and friction wear tests performed on an MRTR-1 multifunctional tester to study effect of surface doping with trace amounts Al2O3 its content tribological properties composites. The morphology composite material was characterized a t...

BACKGROUND The present study aimed to develop an in vitro model for stain removal from natural enamel for the assessment and comparison of oral hygiene products. METHODS Bovine teeth (n = 8 per group) were ground/polished to provide flat enamel specimens and ferric-tannate deposits were precipitated onto the enamel surfaces. The ferric-tannate stained enamel specimens were brushed using an in...

Optimization of the wire sawing process of silicon ingots requires a profound understanding of the dynamic interaction of wire, slurry and silicon material. In this paper, the influence of wire velocity and applied wire stress on the process is investigated using dissipative particle dynamics and discrete element simulations for modelling the fluid and the grains in the abrasive suspension. In ...

This report shares the feasibility study results of abrasive flow polishing of microbores of size φ500 μm or smaller and 25∼50 in aspect ratio for both metal and ceramic materials. A polishing device was designed and built up so as to create enough turbulence for facilitating the polishing at the inner walls of the micro-bore. Polishing of micro-bores on 3 materials: S45C, SS304 and Zr2O3 of le...

A new approach using Fixed Abrasive (FA) pads has been undertaken to overcome the problem of non-uniform thick film Silicon-on-Insulator (SOI) wafers after CMP polishing. The theoretical models indicating the advantages of the 2-body system of the fixed abrasive configuration vs. the conventional 3-body system of slurry based polishing have been convincingly demonstrated in practise upon experi...

The association between a toothbrush and a dentifrice is the most used denture cleaning method. The purpose of this study was to evaluate the abrasiveness of specific and non-specific denture cleaning dentifrices on different heat-polymerized acrylic resins. Sixteen specimens (90 x 30 x 3 mm) of each acrylic resin (QC-20, Lucitone 550, Clássico, Vipi-Cril) were prepared and randomly assigned to...