Powder Metallurgy Joining With Dissolved Binder for Uniform Interfaces
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Solution Overview
Problem
Existing methods for joining metal components often result in weak bonding regions due to defects and thermal stresses, which can lead to failure under fatigue loading, and do not ensure uniform properties across the interface.
Innovation Solution
A method involving the use of metal powder components with closely matched alloy compositions, solvent dissolution of joining surfaces, and sintering or oxidation to create a coherent object with uniform properties, using a mixture of dissolved binder and metal powder between the surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding or soldering is used to join metal components, then strong bonding can be obtained, but defects or thermal stresses arise leading to weak regions under fatigue loading
Solution Approach 1:
The invention changes the joining mechanism from thermal processes (welding/soldering) to a cold joining process using soluble binders. The binder composition and solvent selection are optimized to achieve complete dissolution and seamless bonding, eliminating thermal stresses and defects while maintaining high bonding strength and fatigue resistance
Solution Approach 2:
A soluble binder acts as an intermediary material between the two metal powder components. The binder dissolves completely in the selected solvent, allowing the metal powder particles to come into direct contact and form a seamless interface, eliminating the weak bonding region problem inherent in traditional joining methods
2Ease of manufacture
If traditional joining methods are used, then components can be connected, but the interface region exhibits non-uniform properties and potential defects
Solution Approach 1:
The invention optimizes multiple parameters including binder composition, solvent selection, component saturation level, and drying conditions to achieve complete binder dissolution. This results in a uniform interface with consistent properties across the joined region, eliminating the non-uniformity and defects associated with traditional joining methods
Solution Approach 2:
The binder is pre-applied to the joining surfaces of both components before assembly. This preliminary action ensures that when components are joined, the binder is already in position to facilitate complete dissolution and uniform bonding, preventing interface defects and ensuring consistent properties across the joint
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 produces a strong, fatigue-resistant bond with uniform properties across the joint, eliminating weak points and enabling the manufacture of larger, uniform components without the need for large-scale processing equipment.
Implementation Method 1
enabling the joining by: at least partly dissolving the first joining surface and/or the second joining surface by applying a solvent
Implementation Method 2
bringing the first joining surface in contact with the second joining surface and maintaining this contact for a time period allowing for at least some evaporation of the solvent
Implementation Method 3
sintering or oxidizing the first and second components together while maintaining the first and second joining surfaces in contact
Implementation Method 4
sintering or oxidizing the first and second components together while maintaining the first and second joining surfaces in contact
Data Source
AI summary
A method of manufacturing an object by joining a first component and a second component. The first component comprises metal powder with a first alloy composition and a first soluble binder, and the second component comprises metal powder with a second alloy composition and a second soluble binder. They may further comprise ceramic powder. At least one of the surfaces to be joined is dissolved before they are brought in contact, or a mixture of metal powder with a third alloy composition and a dissolved third binder is arranged there between. The chemical differences between the first, second, and third alloy compositions are within predetermined limits. The components are sintered or oxidized together whereby it is possible to obtain an object wherein the transitions between the material phases from the joined components are close to inconspicuous when analysed with scanning electron microscopy.