Multilayer TiN/Ti/TiZr Coating for Surgical Implants
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Solution Overview
Problem
Current biomaterials used in surgical implants, such as 316L stainless steel and titanium alloys, face limitations including toxicity, corrosion, wear resistance, and osseointegration issues, leading to restricted service periods and adverse biological reactions.
Innovation Solution
A thin-film multilayered coating process involving a combination of TiN, Ti, and TiZr layers is developed, applied via PVD-DC magnetron sputtering, to enhance mechanical and biological properties, including corrosion and wear resistance, biocompatibility, and osseointegration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If 316L stainless steel and Co-Cr alloys are used for surgical implants, then mechanical strength is improved, but toxicity and corrosion resistance deteriorate due to release of Ni, Cr, and Co ions
Solution Approach 1:
The invention applies a multilayer coating system comprising TiN, Ti, and TiZr layers on the implant surface. This composite structure combines the advantages of different materials: TiN provides hardness and wear resistance, while Ti and TiZr layers provide biocompatibility and corrosion resistance by preventing ion release into the biological environment.
Solution Approach 2:
The invention uses thin film coatings (each layer 550-590 nm thick) to modify the implant surface. These thin films create a protective barrier between the base metal and the biological environment, preventing toxic ion release while maintaining the mechanical properties of the underlying metal substrate.
2Stress or pressure
If Ti-6Al-4V ELI alloy is used for implants, then modulus of elasticity is improved to match bone, but long-term performance deteriorates due to release of Al and V ions
Solution Approach 1:
The thin film multilayer coating acts as a protective barrier on the Ti-6Al-4V ELI alloy surface, preventing the release of toxic Al and V ions into the biological environment while allowing the underlying alloy to maintain its optimized modulus of elasticity for bone integration.
Solution Approach 2:
The coating system creates a composite structure where the TiN/Ti/TiZr layers provide chemical inertness and biocompatibility, protecting the Ti-6Al-4V ELI substrate from degrading into toxic ions while preserving its mechanical properties.
3Object-affected harmful factors
If titanium and its alloys are used for surgical implants, then biocompatibility is improved, but wear resistance deteriorates due to severe wear and high friction coefficient
Solution Approach 1:
The multilayer coating combines TiN (providing high hardness and wear resistance with low friction) with Ti and TiZr layers (providing biocompatibility). This composite structure allows the implant surface to exhibit both excellent biocompatibility and superior wear resistance, eliminating the trade-off between these two properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The coating significantly improves the mechanical and biological performance of surgical implants by reducing genotoxicity, cytotoxicity, and enhancing cellular proliferation and osseointegration, extending the service life and safety of implants.
Implementation Method 1
A thin-film multilayered coating process involving a combination of TiN, Ti, and TiZr layers is developed, applied via PVD-DC magnetron sputtering
Implementation Method 2
applied via PVD-DC magnetron sputtering
Data Source
AI summary
The present invention discloses a process for the manufacture of a thin-film multilayered coating used in treating biomedical substrates and a coating in multilayered thin-film form (S/TiN/Ti/TiZr) to treat biomedical substrates used in surgical implants.