Advanced ceramics: evaluation of the ground surface

Abstract

The aim of this research is to evaluate the influence of grinding and cutting conditions on surfaces of advanced ceramics ground with diamond grinding wheels containing a binding resin bond. The quality surface was analyzed by Scanning Electron Microscopy (SEM).

Sintering properties of zirconia-based ceramic composite

“…9 The Vickers hardness of the composites were determined from the dimensions of indent generated by indentation of sample surface with a pyramidal diamond indenter (Matsuzawa Seiki: MV-1, Japan) with applied load of 10 kg. Subsequently, the fracture toughness of the composites were determined via indentation method by using an equation proposed by Niihara et al 10 which utilizes the length of the propagating cracks from the four corners of the same indent made for hardness measurement, as shown in equation (1). A total of five indents were made per sample and the average values were reported.…”

“…These compounding difficulties result in the high cost of machining advanced ceramics, which accounts up to 80% of the production cost, and remain an obstacle to large-scale ceramic industrial manufacturing. 1 Soaring energy and material costs of late necessitate new machining techniques such as electro-discharge machining (EDM), laser-assisted machining and ultrasonic machining to be explored as a more efficient manufacturing process with lower cycle times and waste generation.…”

Evaluation of neural models applied to the estimation of tool wear in the grinding of advanced ceramics

“…Some studies demonstrate that the wear rate of diamond layer is an important parameter in ceramic grinding; it affects the material removal rate as well as the G ratio (Bianchi et al, 2003;Li et al, 2007).…”

“…Grinding stands out as one of the most important stages in the machining process of this type of ceramic, because it is highly complex and involves the contact of a large number of abrasive particles with the workpiece surface, providing more precise dimensional control and excellent finish (Bianchi, Aguiar, Silva, Silva Jr., & Fortulan, 2003;Do Nascimento et al, 2015). On the other hand, the extreme hardness and brittleness associated with engineering ceramics cause high grinding forces, low material removal rate, high wheel wear, as well as surface and sub-surface damage (Emami, Sadeghi, Sarhan, & Hasani, 2014).…”

Neural Tool Condition Estimation in The Grinding of Advanced Ceramics

“…Destaca-se no processo de usinagem deste tipo de cerâmica a retificação como sendo um dos estágios mais importantes, pois é de elevada complexidade e envolve o contato de grande número de partículas abrasivas com a superfície da peça [3].…”