Chapter 7 - Wear properties of the matrix

Abstract

This chapter discusses the complexity of the matrix wear, which seems to be equally a system property and material characteristic. During sawing or grinding with diamond tools, the interactions between the work piece debris and matrix occur in a variety of forms depending on the size of the abrasive swarf, its shape, cleavage properties, hardness, loading conditions, particle movement, speed and pattern, etc. Identification of minerals in the work piece, that cause abrasion, is also an important consideration. Minerals that are too soft to abrade may still wear the material but the mechanisms involved are different; for example, thermal fatigue, oxidation, and removal of oxide layers by abrasion, etc. The two-body abrasive wear is the most rapid and severe means of removing material; therefore, it is of utmost importance that the diamond protrusion ensures sufficient clearance to keep the matrix remote from the work piece surface asperities. The three-body abrasive wear arises when hard abrasive particles are introduced between a pair of sliding surfaces. Diamond crystals protruding above the matrix aid its overall wear resistance by preventing the matrix from direct rubbing against the processed material and direct blockage of abrasion grooves.