Correct option is B
Lead is
not suitable for lapping due to its extremely soft nature and low melting point. During the lapping process, which involves abrasive materials for fine surface finishing, soft metals like lead can deform, clog the abrasive particles, and fail to achieve a smooth and precise surface. Additionally, lead tends to smear rather than grind or polish, making it unsuitable for this process.
Lapping Process:
· A precision finishing process where abrasive slurry is used on a lapping plate to remove minute amounts of material and improve surface finish.
· Used for achieving extremely smooth and flat surfaces.
Materials Suitable for Lapping: Hard metals like
tungsten, brass, and copper are more suited to lapping due to their ability to withstand fine abrasive action without excessive deformation.
Common Applications:
Lapping is used for components like valve seats, piston rings, precision gauges, and optical components.
