Why Is A Hydraulic Press Used For Pre-Deformation Treatment? Enhance Coating Hardness & Thermal Stability

A hydraulic press is used to mechanically induce specific microstructural defects prior to heat treatment to ensure the coating retains its hardness. By applying a compression rate of 15% to 40%, the press introduces high-density dislocations into the arc-sprayed coating, which serve as the foundation for long-term thermal stability.

The primary function of pre-deformation is to create internal barriers that prevent the coating's structure from relaxing or softening when exposed to high heat.

The Mechanism of Stabilization

Introducing High-Density Dislocations

The hydraulic press exerts significant force to compress the coating material within a specific range.

This mechanical stress intentionally generates a high density of dislocations throughout the coating's structure.

Forming Barriers Against Movement

During the subsequent heat treatment, these mechanically induced dislocations serve a critical protective function.

They act as physical barriers that inhibit the movement of polygonal sub-boundaries.

By restricting this movement, the process prevents the microstructural changes that typically lead to softening.

Solving Thermal Stability Issues

Stabilizing Nano-Substructures

Standard heat treatment without pre-deformation can often degrade a coating's fine structure.

The combined process of deformation followed by heat treatment effectively stabilizes the nano-substructures.

This ensures the internal architecture of the material remains intact despite thermal stress.

Retaining Hardness at High Temperatures

This technique directly addresses the thermal stability issues common in traditional coatings.

The coating is able to maintain high hardness even when exposed to high temperatures for extended periods.

Testing confirms stability during exposures ranging from 90 to 180 minutes.

Critical Process Parameters

The Importance of the Compression Window

The effectiveness of this treatment relies strictly on adhering to the 15% to 40% compression rate.

Applying insufficient pressure will fail to generate the necessary density of dislocations to act as barriers.

Conversely, ignoring this step renders the subsequent heat treatment less effective for hardness retention.

Making the Right Choice for Your Goal

To maximize the performance of your arc-sprayed coatings, consider these specific applications:

If your primary focus is High-Temperature Durability: Prioritize the pre-deformation step to "lock" the microstructure, ensuring hardness persists during 90-180 minute thermal cycles.
If your primary focus is Process Consistency: Strictly calibrate your hydraulic equipment to maintain the 15% to 40% compression window, as this is the variable that dictates success.

By mechanically engineering the microstructure first, you ensure the coating survives the thermal environment that follows.

Summary Table:

Process Step	Mechanism	Key Outcome
Pre-Deformation	15% - 40% Compression rate	High-density dislocation generation
Microstructure	Dislocation barrier formation	Inhibits sub-boundary movement
Heat Treatment	Thermal exposure (90-180 min)	Stabilized nano-substructures
Final Result	Mechanical engineering	High hardness retention at high temps

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References

O.V. Makhnenko, D.V. Kovalchuk. Modelling of temperature fields and stress-strain state of small 3D sample in its layer-by-layer forming. DOI: 10.15407/tpwj2017.03.02

This article is also based on technical information from Kintek Solution Knowledge Base .