Thermospray, also called thermal spray in broader engineering terminology, may be worth evaluating when a mining component faces severe wear, corrosion, friction, erosion, or other harsh operating conditions. The right choice depends on the failure mechanism, substrate, geometry, damaged area, operating environment, and required dimensional finish.
Sputtek provides Thermospray coatings, including Pulsed HVOF, alongside PVD coating services. This guide explains how mining teams can assess whether that type of process fits a component, when PVD or DLC may require a different evaluation, and what to verify before selecting a supplier.
Key Takeaways
- Understanding the dominant failure mode is crucial for selecting the right coating process.
- Thermospray and Pulsed HVOF are effective for severe wear and corrosion protection in mining components.
- PVD and DLC coatings serve different purposes and are not interchangeable with thermal spray.
- Comprehensive documentation of the component’s condition and operating history is essential for supplier evaluation.
- Establishing baseline measurements and acceptance criteria is critical before production approval.
Quick summary
- Start with the dominant failure mode, such as abrasion, erosion, corrosion, impact, friction, or dimensional loss.
- Evaluate Thermospray or Pulsed HVOF against the component’s substrate, geometry, damaged areas, and operating conditions.
- PVD and DLC are not interchangeable with thermal spray. Their suitability depends on different surface, friction, adhesion, and geometry requirements.
- Verify cleaning, blasting, masking, fixturing, coating, finishing, inspection, documentation, and production-scaling capabilities.
- Establish baseline measurements and acceptance criteria before approving a coating for regular production.
What Thermospray means for mining applications
Thermal spray is the broader technical term for processes that apply a coating to protect an underlying material. The National Research Council Canada’s overview of thermal spray applications identifies protection against harsh environments involving extreme temperatures, wear, or corrosion and lists mining among the relevant industries.
Thermospray is used by Sputtek as a current service term, including Pulsed HVOF capability. The practical question is whether the proposed process can address the component’s actual failure mode while meeting requirements for adhesion, geometry, surface condition, dimensional control, and service environment.
Mining parts can encounter abrasive particles, impact, moisture, chemicals, heat, sliding contact, and fluctuating loads. A coating assessment therefore needs to consider the complete component and operating system rather than treating the surface problem in isolation.
Start with the mining component’s failure mode
A useful coating decision begins with evidence from the failed or worn part. Record where the damage occurs, how quickly it develops, whether it is localized or widespread, and whether it changes with material, production rate, lubrication, temperature, or maintenance practices.
| Failure mode | What to document | Why it matters |
|---|---|---|
| Abrasion | Particle type, size, concentration, contact location, and wear pattern | Helps determine whether the surface needs protection against sustained material removal. |
| Erosion | Particle velocity, flow direction, impact angle, and affected areas | Shows whether a moving stream or repeated particle impact is driving damage. |
| Corrosion | Moisture, chemicals, salts, temperature, and exposure duration | Identifies the environment the coating must tolerate. |
| Friction or adhesion | Sliding interfaces, lubrication, speed, heat, and transfer marks | May point toward a friction-focused surface-engineering assessment. |
| Impact | Impact frequency, contact geometry, cracks, chips, and deformation | Helps establish whether the component and coating system can tolerate mechanical shock. |
| Dimensional loss | Original dimensions, worn dimensions, tolerance, and material loss | Separates a protective coating question from possible repair or rebuilding. |
Identify whether the part is new, worn, repaired, or being reconditioned. Photographs, inspection records, maintenance notes, rejected components, and measurements from good and failed parts give a supplier a more reliable starting point.
Sputtek identifies component coating applications as part of its industrial surface-treatment work. That does not make every mining component suitable for the same process. Exposure to abrasion, impact, friction, and corrosion must still guide the assessment.
When Thermospray or Pulsed HVOF may be worth evaluating
A technical review may be appropriate when a component operates in a harsh environment involving substantial wear or corrosion, when damage is concentrated in specific areas, or when recurring surface degradation contributes to maintenance work. It may also be worth investigating when the underlying component remains structurally suitable but its working surface needs protection or further evaluation.
These are evaluation triggers, not guarantees of coating suitability or service-life extension. A supplier still needs to review the substrate, heat treatment, dimensions, accessible surfaces, edges, radii, existing damage, and operating conditions.
Be cautious when a part has cracks, severe deformation, contamination, unstable base material, or damage beyond the working surface. Coating should not conceal an unresolved design, alignment, lubrication, material, or process problem. The correct next step may involve repair, machining, cleaning, redesign, or a controlled trial.
Thermospray vs PVD and DLC
Thermospray or Pulsed HVOF, PVD, and DLC belong to a broader surface engineering decision, but they are not interchangeable. PVD and DLC may be considered for selected tools, components, and production parts where friction, adhesion, wear, or surface durability are central. Thermal spray may warrant evaluation where harsh wear, corrosion, or a need to treat a particular surface condition is central.
| Comparison point | Thermospray or Pulsed HVOF | PVD or DLC |
|---|---|---|
| Primary question | Can the process protect or treat a surface exposed to demanding wear, corrosion, or other harsh conditions? | Can a controlled surface treatment address friction, adhesion, wear, or durability? |
| Part condition | Review whether the substrate and damaged areas are suitable. | Review cleanliness, finish, edges, previous coatings, and dimensional condition. |
| Geometry | Assess access, masking, transitions, and areas requiring finishing. | Assess fixture access, exposed surfaces, geometry, and dimensional sensitivity. |
| Damage level | Discuss protection, localized treatment, or reconditioning. | Evaluate the existing surface and dimensions before treatment. |
| Evidence needed | Failure mechanism, substrate, environment, damaged zones, and finishing requirements. | Failure mechanism, friction or adhesion concerns, substrate, geometry, and tolerances. |
A strong supplier recommendation should explain why the proposed process fits the failure mode and why other options were not selected. A generic statement that a coating is “wear resistant” does not establish suitability for a particular mining component.
Technical information to provide
Send enough information for the supplier to assess the component as an engineered part, not simply as a material sample:
- Substrate: material grade, heat treatment, hardness, repairs, welds, and previous coatings.
- Dimensions: critical dimensions, tolerances, finishing allowance, and areas that must remain unchanged.
- Geometry: drawings or models showing edges, radii, recesses, bores, threads, internal surfaces, and difficult-to-access areas.
- Damage: photographs, worn and unworn dimensions, cracks, deformation, and affected zones.
- Operating conditions: temperature, speed, load, impact, contact type, lubrication, moisture, chemicals, and abrasive exposure.
- Production information: quantity, batch frequency, replacement rate, trial quantity, and whether the requirement is repair or recurring production.
- Acceptance requirements: inspection points, surface finish, dimensional limits, documentation, and traceability.
Also explain what happens before the part fails. Damage may result from misalignment, excessive load, contamination, unsuitable lubrication, or an unstable upstream process rather than the surface alone.
Supplier capabilities to verify
Evaluate the complete workflow, not only the deposition equipment. Ask how the supplier receives and inspects parts, confirms substrate condition, cleans and prepares surfaces, protects areas that must remain uncoated, handles fixturing, applies the coating, finishes the part, and verifies the result.
Sputtek’s supplied capabilities include in-house degreasing and cleaning, sandblasting, microblasting, stripping and polishing, after-coating lapping, and quality-control laboratory testing. Its business information also describes support from prototyping through high-volume manufacturing. These capabilities are relevant questions for any supplier evaluation, but they do not establish that a particular mining component will meet its performance requirements.
When reviewing coating equipment selection, consider part size, batch weight, fixture flexibility, process documentation, preparation capacity, post-processing, inspection, and the path from trial work to repeat production.
A practical supplier-evaluation checklist
- Has the dominant failure mode been documented with photographs, measurements, and maintenance history?
- Has the substrate, heat treatment, previous coating, and repair history been confirmed?
- Has the supplier reviewed drawings, tolerances, edges, radii, bores, masking areas, and fixture access?
- Has the proposed process been explained in relation to abrasion, erosion, corrosion, friction, impact, or dimensional loss?
- Are cleaning, blasting, surface preparation, masking, and fixturing defined?
- Are stripping, polishing, lapping, machining, or other post-processing requirements identified?
- Are inspection methods, acceptance criteria, traceability, and documentation agreed before the trial?
- Will baseline measurements be taken for comparison with the coated part?
- Is there a controlled trial plan and review point before production approval?
- Can the supplier support the required volume and repeatability if the evaluation succeeds?
A simple decision path
- Define the failure: Identify what is wearing, corroding, sticking, cracking, eroding, or losing dimension.
- Characterize the environment: Record particles, moisture, chemicals, temperature, loads, speed, impact, and lubrication.
- Assess the part: Confirm substrate, heat treatment, geometry, tolerances, surface condition, and repair history.
- Compare processes: Ask whether Thermospray or Pulsed HVOF, PVD, DLC, repair, or another treatment fits the evidence.
- Review supplier controls: Verify preparation, coating, finishing, inspection, documentation, and production capacity.
- Run a controlled evaluation: Establish baseline measurements and acceptance criteria before regular use.
Frequently asked questions
Is Thermospray the same as thermal spray?
Thermal spray is the broader engineering term. Thermospray is used by Sputtek as a service label, including Pulsed HVOF. The relevant decision is whether the proposed process fits the component’s failure mode and operating conditions.
What information should I send to a coating supplier?
Provide the substrate and heat treatment, drawings, tolerances, geometry, damaged areas, photographs, operating conditions, production volume, surface history, and acceptance requirements.
Can Pulsed HVOF be used on a worn component?
It may be worth evaluating, but suitability depends on the substrate, damage depth, geometry, surface preparation, dimensional requirements, and finishing route. The supplier should determine whether the part needs repair, reconditioning, or another treatment.
Does every mining component need a corrosion-resistant coating?
No. Corrosion protection is relevant when the operating environment creates a corrosion mechanism. The decision should account for all dominant mechanisms, including abrasion, erosion, impact, friction, temperature, and dimensional loss.
Conclusion: Build the coating decision around the failure mode
Thermospray or Pulsed HVOF may be worth evaluating for mining components exposed to severe wear, corrosion, erosion, friction, impact, or other harsh conditions. The right assessment starts with the failure mechanism and considers the substrate, geometry, damage, operating environment, finishing requirements, inspection plan, and production volume.
Document the component’s condition and operating history before requesting an assessment. To discuss PVD, Thermospray, Pulsed HVOF, preparation, finishing, and quality-control requirements, contact Sputtek with the available part details and failure evidence.
