Binder Jet 3D Printed Titanium Implant with Ceramic Coating Adhesion
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Solution Overview
Problem
Ceramic coatings for implants face challenges in adhering to substrates due to smooth surfaces and high forces, while 3D printing of implant substrates is time-consuming and expensive, necessitating a cost-effective and efficient method for producing a rough surface for ceramic plasma spray coatings.
Innovation Solution
Employing binder jet 3D printing to create a naturally rough metallic substrate with interlocking components that enhance the adhesion of ceramic plasma spray coatings, using a porous titanium substrate with retention features to improve the strength and durability of the implant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If traditional 3D printing methods are used to create implant substrates, then complex shapes can be achieved, but the production process is time-consuming and expensive
Solution Approach 1:
The patent changes the printing parameters by using binder jet technology with optimized particle size distribution (bimodal or multimodal distribution) and binder characteristics to achieve faster printing speeds while maintaining complex geometric fidelity. The substrate porosity and surface roughness are also optimized through parameter control to enable subsequent ceramic coating adhesion
2Ease of manufacture
If a smooth substrate surface is used, then the implant structure is simple to manufacture, but ceramic coating adhesion is poor
Solution Approach 1:
The patent applies local quality by creating specific surface regions with enhanced roughness and interlocking features only where ceramic coating adhesion is needed, while maintaining smooth surfaces in load-bearing areas. The binder jet process selectively deposits material to create micro-roughness patterns that promote ceramic coating mechanical interlocking without compromising overall substrate integrity
3Reliability
If a rough surface is created on the substrate, then ceramic coating adhesion improves, but the substrate manufacturing complexity increases
Solution Approach 1:
The binder jet 3D printing process self-generates the required surface roughness and interlocking features during substrate fabrication, eliminating the need for separate surface treatment operations. The selective deposition of binder and particles naturally creates micro-roughness patterns that serve dual purposes: structural integrity and ceramic coating adhesion promotion
4Strength
If ceramic coatings are applied to withstand high forces, then component durability improves, but the risk of delamination increases without proper surface preparation
Solution Approach 1:
The patent creates a composite structure where the metallic substrate and ceramic coating are bonded through mechanically interlocking interfaces. The binder jet-substrate provides a roughened surface that mechanically anchors the ceramic plasma spray coating, creating a composite material system that leverages the high strength of ceramics and the ductility of metal while preventing delamination under high force conditions
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 method results in a cost-effective and efficient production of implants with improved ceramic adhesion and strength, reducing the risk of delamination and extending component life through the use of a binder jet printed substrate with retention features for ceramic plasma spray coatings.
Implementation Method 1
a metallic substrate formed by additive manufacturing
Implementation Method 2
ceramic plasma spray coatings
Data Source
AI summary
An implant can be implantable into a human body and can include a metallic substrate and a ceramic layer. The metallic substrate can be formed by additive manufacturing. The metallic substrate can be engageable with a bone. The metallic substrate can include an inner surface, an outer surface, and a plurality of retention features. The inner surface can define a plurality of pores configured to promote bone ingrowth into the metallic substrate. The plurality of retention features can include a proximal portion connected to the outer surface and the proximal portion can define a proximal width. The ceramic layer can be a bearing surface that can be spray coated to the metallic substrate and formed around the retention features to interlock the ceramic layer with the metallic substrate.