FOR INTERNAL USE ONLY
15
WEAR PATTERNS AND PRODUCT SELECTION
It is often advantageous to apply a wear protective coating in a pattern or in a selected area rather than covering the whole part with the alloy because: (I) It can be deposited in less time. (ii) A wear pattern can encourage entrapment of the wearing media and thus act as a wear protective coating or it may encourage easy flow of material across the face of the part. and (iii) It may encourage a self sharpening action, (see later). Wear patterns are normally associated with abrasion, impact or abrasive/impact wear and only these conditions will be considered.
15.1 WEAR PATTERNS FOR ABRASIVE AND IMPACT WEAR
The type of wear patterns used is dependent upon the type and size of the wearing media and to some extent the base material. The patterns must either prevent contact from the wearing media with the base metal by itself providing the barrier, or it must encourage the wear media to become entrapped inside the pattern thus preventing further contact with the base metal. Let us consider the type of wearing media and then suggest possible wear patterns. Large Particle Wear, i.e. rocks. It is not possible to entrap rocks in a wear pattern to provide protection. Therefore we must consider either complete coverage of the base metal to prevent contact, or lines of wear facing material suitably spaced to prevent contact.
WELDING AND COATING METALLURGY2
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