Abstract
Cellular SiC/iron alloy composite with a spatial structure of mutually intersecting skeletons created with a porous ceramic preform has not been obtained before, despite promising spectrum of potential uses. We tested the possibility of obtaining such material using a SiC material with an oxynitride bonding and grey cast iron. Porous ceramic preforms were made by pouring the gelling ceramic suspension over a foamed polymer base which was next fired. The obtained samples of materials were subjected to macroscopic and microscopic observations as well as investigations into the chemical composition in microareas. It was found that the minimum width of a channel in the preform, which in the case of pressureless infiltration enables molten cast iron penetration, ranges from 0.10 to 0.17 mm. It was also found that the ceramic material applied was characterized by good metal wettability. Were the channels are wide enough for the metal penetration we observed that the ceramics/metal contact area always has a transition zone in which mixing of both components takes place.
Highlights
IntroductionAt the core of research on ceramic/metal composites are attempts to develop a casting technology for machine elements and devices working in intensive abrasive wear conditions
At the core of research on ceramic/metal composites are attempts to develop a casting technology for machine elements and devices working in intensive abrasive wear conditions.It is known that composite can be defined as a combination of two inherently different materials that gains properties exceeding these of the constituent materials
We confirmed a possibility of obtaining a composite in a form of mutually intersecting sceletons using a SiC material with an oxynitride bonding and grey cast iron material
Summary
At the core of research on ceramic/metal composites are attempts to develop a casting technology for machine elements and devices working in intensive abrasive wear conditions. Ceramic-metal composites with interpenetrating networks structure can be obtained by infiltration of previously prepared porous ceramic preforms with molten metal The preparation of this kind ceramic material can be carried out by e.g. by sintering the fractionated grains [1014], gelling a foamed ceramic suspension [6, 8, 15,16,17] or using open-cell polymer foam. We want to present the results of preliminary tests aimed at obtaining a cellular SiC/iron alloy composite with a spatial structure of mutually intersecting networks through pressureless infiltration of porous ceramic preform with molten metal. The preforms were heat treated at 600°C in air atmosphere In such conditions, the foam burns out completely and a porous material is obtained with open channels that replicate the original polymer foam structure. The obtained samples of materials were subjected to macroscopic and microscopic observations as well as investigations into the chemical composition in microareas by means of a Mira 3 scanning electron microscope, produced by Tescan, equipped with an EDS spectroscope (Aztek system produced by Oxford Instruments)
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