PLEXUS® processes for the deposition of boron compounds utilizes chemical vapor deposition reactions by the pack cementation method to optimize the formation of borides with other selected elements in various basis metals to achieve a desired alloy in the substrate of those basis metals. The boride alloys formed are an integral part of the basic metal. Their properties are controlled by a careful selection of the alloying elements in the system, and by suitable control of the thermodynamics and kinetics of deposition reactions. As a result of past experiments, we have selected the more promising alloying systems for commercial application.
TYPES OF BORIDE ALLOYS
Penetration to .040" possible. Excellent for use where post heat-treatment is required, or for deposition of a precarburized substrate.
Penetration up to .020" economically realized. Excellent for wear contact with other systems.
Penetration over .040" realized. Best system for use on 400 series stainless steels.
Penetrations up to .020" possible for extra hardness and galling resistance for titanium substrates.
LUBRICATED BORIDE ALLOYS
We are pleased to now have available all the properties of a Boride Alloy plus a dry self-lubricating surface. This new and exciting multi-layer coating will further extend borides' resistance to wearing, galling, and friction.
OTHER ALLOYING SYSTEMS AVAILABLE
Boride coating systems for refractory metals (W, Ta, Cb, Mo bases) substrates.
Aluminide coating systems available for high temp oxidation and sulfidation on nickel and cobalt based substrates.
Chromizing of steel substrates for hard low-coefficient of friction protection
Rock Bit NozzlesValve Seats
Medical Circular Blades High Pressure Water Nozzles
Metal Seal Faces Chain Saw Teeth
Steam Nozzles Friction Journals
Steel Cutting Tools Extended Nozzles
Compressor Impellers Slitter Knives
Pump Impellers Ball Valves
Extrusion and Draw Dies Pump Casings
Plexus® Boride Deposition Alloying
ALLOYED PROPERTIES IN FERROUS SUBSTRATES
Hardness - 1500 - 2200 KHN R/C 57-82
Hardness - Depends upon base alloy and boride system
Wear Resistance - Excellent against all hard surfaces
Corrosion Resistance - Excellent in HCL, H2SO4, H2S, HF, and salt water.
Coefficient of Friction - Low, approximately 1/3 that of the substrate
Adherence - Excellent gradiated metallurgical bond, not mechanical.
Galling Resistance - Excellent against all wearing surfaces.
Gas Barrier - Excellent against oxygen, hydrogen, and hydrogen sulfide
Penetration - Can penetrate from 0.003" to 0.040" (nominal 0.018" - 0.022")
Abrasion resistance - Excellent against abrasives in liquids, and dry flowing
abrasives. Micro-hardness comparisons on steel using
Knoop Indenter, 200gm, load, Tukon® micro-hardness tester are shown below.