Titanium-Coated Aluminum Sintering Material for Porous Compacts
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Solution Overview
Problem
Existing methods for producing porous aluminum sintered compacts face challenges in achieving high porosity, sufficient strength, and dimensional accuracy due to oxide films hindering bonding between aluminum base materials and requiring lengthy binder removal processes.
Innovation Solution
An aluminum sintering material comprising aluminum base materials with titanium powder particles fixed to their surfaces, which breaks oxide films during sintering, forming columnar protrusions for bonding and maintaining shape, reducing the need for foaming and minimizing binder usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxide films are present on aluminum base material surfaces, then the aluminum can be protected from oxidation, but the bonding between aluminum base materials is hindered
Solution Approach 1:
A silane-based coupling agent is introduced as an intermediary substance between the aluminum base materials. This coupling agent reacts with the oxide films on the aluminum surfaces and forms strong chemical bonds, thereby mediating the bonding process and overcoming the hindrance posed by oxide films while maintaining oxidation protection.
Solution Approach 2:
The surface chemistry of the aluminum base materials is changed by applying a silane-based coupling agent treatment. This parameter change modifies the surface properties to enable better bonding while preserving the bulk oxidation resistance of the aluminum material.
2Ease of manufacture
If a viscous composition with binder is used for shaping, then the aluminum base materials can be formed into desired shapes, but the binder removal treatment becomes lengthy and the shrinkage ratio increases
Solution Approach 1:
The binder component is extracted or eliminated from the composition system. Instead of using a viscous composition with binder, the invention uses a powder mixture that can be shaped through other means, thereby removing the source of the lengthy binder removal treatment and excessive shrinkage.
Solution Approach 2:
The invention replaces the persistent binder with a temporary shaping aid that can be easily removed or decomposed, reducing the time required for removal treatment and minimizing the shrinkage ratio during sintering.
3Productivity
If aluminum base materials are sintered together, then porous aluminum sintered compact can be produced, but the porosity is insufficient due to bridging portions with hypereutectic structure
Solution Approach 1:
The chemical composition parameters of the sintering mixture are changed by incorporating specific oxide powders (such as aluminum oxide, silicon oxide, or boron oxide) and controlling the particle size distribution. This parameter change prevents the formation of hypereutectic bridging portions and enables precise control over the porosity of the sintered compact.
Solution Approach 2:
The invention uses a composite material system combining aluminum base materials with specific oxide powders. This composite approach allows for controlled sintering behavior that produces the desired porosity while maintaining structural integrity, avoiding the formation of unwanted hypereutectic structures.
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
This approach enables the efficient production of porous aluminum sintered compacts with high porosity, sufficient strength, and excellent dimensional accuracy at a lower cost, without the need for additional foaming steps and with reduced shrinkage ratios.
Implementation Method 1
the bonding between the aluminum base materials is hindered by oxide films formed on the surfaces of the aluminum base materials
Implementation Method 2
a porous aluminum sintered compact in which a plurality of aluminum base materials are sintered together
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(d)
Figure 3(a)~3(d)
AI summary
This aluminum sintering material is an aluminum sintering material that is used for producing a porous aluminum sintered compact in which a plurality of aluminum base materials are sintered together, and the aluminum sintering material includes: the aluminum base materials; and a plurality of titanium powder particles fixed to outer surfaces of the aluminum base materials, wherein the titanium powder particles are composed of either one or both of metallic titanium powder particles and hydrogenated titanium powder particles.