Wear-resistant Strengthening Technology of Titanium Rod and Wire

Process: mature and stable wear-resistant solution

Wet Coating

Wet coating is the most widely used wear-resistant treatment process for titanium surface at present, and Cr and Ni-P coatings are typical representatives. Due to the high activity of the oxide film on the surface of titanium metal, the adhesion of the direct chromium plating layer is poor and easy to fall off. Therefore, the general process in the industry is the two-step method of "base layer": first, a layer of Ni is plated on the surface of the titanium rod and titanium wire substrate as a transition layer. layer, improve the adhesion of the plating layer, and then plate Cr on the surface of the nickel layer as a wear-resistant surface layer.

This process adopts electrolytic deposition, the film forming speed is fast, and the thickness of the coating is controllable. The thickness of the ordinary wear-resistant coating can reach several microns, and the thickness of the decorative coating is only 1 μm. The hardness of the coating is high and the coefficient is low. High wear-resistant surface treatment method.

Thermal Diffusion Method

Thermal diffusion processes such as carburization, nitriding, and borination, which were originally widely used in hardening of steel materials, can also be used for wear-resistant treatment of titanium surfaces after adaptation and optimization. Its core principle is to allow carbon, nitrogen, boron and other elements to diffuse into the surface lattice of titanium rods and titanium wires at high temperatures to form a high-hardness titanium compound layer, thereby achieving surface hardening.

The hardness of the treated titanium surface layer can be increased several times, and the hardened layer and the substrate are metallurgically combined, there is no risk of plating layer shedding, and the wear resistance is long-lasting and stable, which is suitable for structural parts that withstand wear.

Surfacing

The surfacing method uses plasma transfer arc as heat source to melt high hardness and wear-resistant alloy materials on the surface of titanium rod and titanium wire to form a metallurgical bonded wear-resistant modified layer. The surface wear resistance of the treated titanium material is excellent, and only the surfacing area is heated locally during the treatment process, and the entire workpiece does not need to be placed at a high temperature, which can effectively avoid the decline in mechanical properties caused by the overall heating of the titanium matrix.

However, the surface roughness of this process is relatively high after treatment, and secondary processing and grinding are required. It is only suitable for titanium rod workpieces with large diameters and high thicknesses, and is not suitable for fine titanium wires for the time being.

Advanced technology: an enhanced new choice for high-end scenarios

In addition to the above processes, vapor deposition surface strengthening technologies such as CVD (chemical vapor deposition), PVD (physical vapor deposition), and PCVD (plasma-enhanced chemical vapor deposition) have gradually matured in recent years and have become the first choice for high-end application scenarios.

This type of process can deposit superhard coatings such as titanium nitride and diamond-like carbon on the surface of titanium rods and titanium wires. The thickness is uniform and controllable, and the coating adhesion is strong. Taking into account composite properties such as corrosion resistance and friction reduction, and the treatment temperature is low, it will not affect the mechanical properties of the titanium substrate, especially suitable for the wear-resistant strengthening of high-precision, small-size titanium wires and precision titanium rods, and can adapt to high-end products such as medical treatment Strict requirements in the field.

With the continuous expansion of titanium application scenarios, surface wear-resistant treatment technology is also iteratively upgraded, which not only further taps the performance potential of titanium rods and titanium wires, but also provides technical support for the application of titanium alloys in more demanding working conditions, has become an important supporting technology direction of the titanium industry.