Bucket Tooth Adapter 61N6-31320 Heavy Equipment Spare Parts

The principle of thermal spraying technology for remanufacturing bucket teeth

The thermal spraying technology adopted in the remanufacturing of bucket teeth is a surface strengthening process that uses a high-temperature heat source to melt or semi-melt wear-resistant materials and then spray them at high speed onto the surface of the substrate. Its core technical principles and application points are as follows:

I. Basic Principles of Thermal Spraying ‌

Material melting and atomization ‌

Heat wear-resistant materials such as tungsten carbide to a molten or semi-molten state by electric arc, plasma arc or flame.

The molten material is atomized into micron-sized particles through compressed air or high-speed gas flow.

Coating deposition mechanism ‌

The accelerated particles strike the base of the bucket teeth at a speed of 100-300m/s, undergoing plastic deformation and flattening.

A dense coating with a layered structure is formed by layer-by-layer stacking, which mechanically bonds with the substrate.

2. Special process for bucket tooth Repair ‌

Tungsten carbide coating strengthening ‌

Material selection ‌ : tungsten carbide powder (WC-Co) with hardness ≥60 HRC is adopted;

Process parameters ‌ : plasma spraying temperature > 12,000℃, particle velocity above 200m/s.

The key to matrix pretreatment is ‌

Sandblasting roughened to Ra≥6.3μm to enhance the adhesion of the coating;

Preheat the substrate to 100-150℃ to reduce thermal stress cracks.

Iii. Technical Advantages and Limitations ‌

Advantages ‌ ‌ limitations ‌

Substrate temperature rise < 200℃ (to avoid deformation) Porosity 3-15% (sealing treatment is required)

The coating thickness is adjustable from 0.1 to 3mm, and the bonding strength is less than 70MPa (lower than that of fusion welding)

High-cost equipment investment for repairing wear on complex curved surfaces

Iv. Application Scenarios Comparison ‌

Repair method: ‌ ‌ Applicable defect: ‌ ‌ bucket tooth case: ‌

Thermal spraying ‌ tooth surface wear, furrow wear, tungsten carbide cladding in the transition zone of the tooth root

Repair of local deep wear and fracture of the tooth tip by surfacing with J507 electrode at ‌

Note ‌ : For the impact load zone at the tooth tip, a composite process is recommended - first, surfacing to restore the size, and then thermal spraying tungsten carbide to enhance wear resistance.

V. Technological Development Trends ‌

High-speed oxygen fuel spraying (HVOF) ‌ : particle velocity over 500m/s, porosity < 1%;

Cold spraying technology ‌ : low-temperature solid deposition, completely avoiding thermal damage to the substrate.

This technology, by depositing wear-resistant layers at low temperatures and with high efficiency, has become a key means to replace traditional surfacing welding in the remanufacturing of bucket teeth.