Products

Bead Mill Disc (Case Study) Problem: Bead mill plates are subjected to abrasion and mild impact caused between continuously striking Zirconia bead and finely powdered product. Cause of the problem: Zirconia beads and powdered product are abrasive in nature. The MOC of the bead mill plate selection should allow a combination of elasticity and hardness yet reduce zirconia bead breakage. Solution: Bead mill working parameters were set to reduce zirconia bead breakage. Bead mill plates were manufactured as follows: SS 410 forged ring was welded to an alloy steel plate. Subsequently the fabricated plate was machined to required dimensions. Polyether based polyurethane of 3 to 5mm thickness was injection molded or cast on the pre fabricated plate. P.U. has a hardness of 90...

Plastic Extrusion Screw (Case Study) Three Zones of screw: Feeding, Compression & Metering. Wear occurs due to addition of non metallic fillers in plastic. Coatings of NiCrBSi with or without addition of tungsten carbide and tungsten carbide - cobalt protect against wear caused by abrasion & corrosion. Coatings are fused with base metal. Coatings are applied by TIG, PTA or HVOF using Robot or servo driven X-Y-Z Manipulator.

Thermal Barrier Coatings (Case Study) The barrier coat reduces the direct effect of temperature by reducing heat transfer caused by conduction, convection & radiation. Thus the base material retains properties which it could have lost at high temperature exposure. The final coating material is normally a ceramic oxide. Industry uses are mostly limited to Stabilized zirconia( Zirconia changes phase at around 1000 deg C) or Alumina. All ceramic oxides are oxygen transparent hence a oxidation resistant bond coat is provided. Coatings can peel off at high temperature due to variation in co-efficient in thermal expansion. Hence depending on base material a graded CTE matched material is applied. We have carried out repairs on Roof jackets of copper blast furnace. The...