Enhancing Mold Surface Hardness via Wear-Resistant Thermal Spraying for Molds

We have accumulated extensive experience in coating applications, and we are currently replicating these successful cases.

Automotive mold spraying with tungsten carbide

Surface hardening treatment for automotive engine molds; wear-resistant coating application for automotive molds.

Offer metal powder coating, wear-resistant metal spraying, and wear-resistant metal coatings.

We can restore scrapped and out-of-tolerance mechanical parts, bringing them “back to life.” Additionally, we can pre-protect the surfaces of new workpieces with wear-resistant and corrosion-proof coatings, effectively “extending their lifespan.”

Using the supersonic flame spraying process, a tungsten carbide coating is applied to enhance the mold surface’s hardness, wear resistance, and corrosion resistance.

Mold wear-resistant thermal spray coating

We specialize in thermal spray coating services for various industries.

If your products have high requirements for surface finish and dimensional accuracy, or if they will be in long-term contact with liquids and thus demand enhanced wear resistance and corrosion protection, you should choose our company’s tungsten carbide coating applied using the American Praxair JP8000 equipment. From materials to equipment, processes to solutions—we’ve got it all covered in coatings.

Screw-type spraying tungsten carbide coating mixing equipment spraying

Sanxin Company’s Thermal Spray Coating Processing Equipment and Capabilities We provide various thermal spray coating services using U.S. PRAXAIR supersonic spraying equipment and U.S. Miller plasma equipment. A. Coating Processing Equipment: We are equipped with more than ten units of advanced coating processing equipment, including U.S. PRAXAIR supersonic spraying systems, U.S. Miller plasma equipment, domestically produced supersonic spraying systems, domestically produced plasma equipment, and arc-spray equipment. B. Coating Processing Workshop: Our workshop features two enclosed spray-coating workstations and one enclosed sandblasting workstation, with an annual capacity to process up to 100,000 coated components. C. Coating Machining Equipment: We have over ten units of various machining equipment, including lathes, high-precision grinding machines, and precision polishing equipment, as well as a complete set of advanced quality inspection equipment and coating surface analysis instruments.

Automotive mold repair, HVOF-sprayed tungsten carbide coating, wear-resistant spray coating

Molds—especially hot-work molds—not only operate in high-temperature environments but also endure wear, compression, impact, and thermal-mechanical fatigue. Consequently, their surface properties typically face stringent requirements. If the surface lacks sufficient hardness, red hardness, oxidation resistance, or corrosion resistance, it will easily degrade during use, shortening the mold’s service life. Therefore, mold surfaces generally undergo surface strengthening treatments.

Supersonic Spraying of WC Tungsten Carbide on Ball Valve Disc

Our company employs an advanced supersonic flame spraying process to apply ultra-wear-resistant tungsten carbide coatings onto various components. The wear resistance of these coatings is 2 to 4 times higher than that achieved by other surface treatment processes and tens of times greater than that of ordinary stainless steel. The superiority of the supersonic process stems from its exceptionally high jet velocity and relatively low temperature at the workpiece surface—typically ranging from 120 to 200 degrees Celsius—which results in an extremely dense coating microstructure with excellent bonding strength. Moreover, the process causes minimal carbon loss and phase transformation in the substrate material. When comparing processes using the same materials, the hardness of supersonic coatings is significantly higher than that of other thermal spray coatings, reaching a hardness of HV1300. As a result, these coatings provide outstanding protection for a wide range of highly wear-prone components.

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