THE LUND PRECISION GROUP
BrazeCoat Ultra-High Density Carbide Coating
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The BrazeCoat process can be applied in two ways.  The BrazeCoat-M Process results in a thicker wear resistant coating, while the BrazeCoat-S process results in a thin, smooth coating.  Both are processed in Lund’s hydrogen atmosphere furnace, and both result in coatings of extremely high tungsten carbide content by weight.

 

With the BrazeCoat-M Process, flexible mats, consisting of carbide powders and filler metal powders (e.g. NiCrBSi), bonded by a polymer binder, are cut into the appropriate sha­pe and placed onto the substrate. After preparation the assembly is heat trea­ted in a furnace process at approx. 1100 °C under the protective hydrogen atmosphere. The carbide layer is infiltrated by the molten filler metal and in the same operation brazed to the substrate. In the BrazeCoat-M process the thickness of the resulting layers can be adjusted between 0.7 mm (0.028 in.) and 3 mm (0.12 in.) or even more. The final layer is conforms to the contour of the part.

 

Typical applications for BrazeCoat M-layers can be found where heavy abrasive wear or even a combination of abrasive and corrosive wear appears. Slurry pump housings, mixer blades and extruder parts, all coated by the BrazeCoat-M process have resulted in signifi­cantly longer component lifetime under actual service conditions.

 

 

With the BrazeCoat-S Process the surfaces of components are protected against severe wear by spray depositing a carbide/hard facing alloy suspension, which is then heat treated in the hydrogen atmosphere fur­nace. The thickness of the resulting layers can be adjusted between 0.05 mm (0.002 in.) and 0.5 mm (0.02 in.).

 

The coatings are well bonded and show a porosity of less than 1%. The surface as coated is very smooth, and for most applications final ma­chining is not necessary. Due to the high car­bide content of the coating layer, hardness values of over 65 HRC are obtained. Wear tests, under laboratory conditions as with components under service conditions in the field, showed improved resistance against abrasive wear over nitrided, borided or ther­mally sprayed layers.

 

The BrazeCoat-S Process has been applied successfully to protect fan blower disks, hou­sings and mill rotors, hydraulic cylinders or plungers and piston rods in hydraulic and pneumatic application, where a severe wear attack is combined with the requirement for narrow tolerances.

Innobraze GmbH

AN INTERNATIONAL LEADER IN ENGINEERED CUTTING SYSTEMS AND WEAR PARTS