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Abstract
The sintered pieces of metallic powders show a particular physical and chemical characteristics, determined both by the composition and the existing phases structure, as well as by the size, shape and distribution of the grains. This paper aims to show the peculiarities of sintering production of a class of composite materials with the iron matrix and their characterization regarding the physico-mechanical properties obtained after sintering. Thus, in order to obtain parts with advanced compactness, the process of double pressing and double sintering is applied. The first pressing is performed with moderate pressures (3000daN/cm2) and sintering at 800°C with a range of about 30 minutes. The second pressing is performed at high pressures (6000÷7000 daN/cm2) and is followed by the final sintering in normal mode. For fused metal sintered metal composites, the most important mechanical property is hardness. This is a function of the bonding forces between the particles, the density and the strength of the material at the test site and can be determined by the Brinell method.
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