Low-Silver Braze Alloy for Hard Metal Joining
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Solution Overview
Problem
High silver content in existing brazing alloys for joining sintered hard metal to iron or steel components is costly and limited by few alternatives with low silver content, making them inefficient for industrial applications like cutting tools.
Innovation Solution
A braze welding alloy with reduced silver content, comprising specific weight percentages of silver, zinc, manganese, nickel, indium, tin, iron, silicon, chromium, and phosphorus, offering optimal adhesion and wettability characteristics suitable for joining sintered hard metals to steel or iron, allowing for cost-effective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high silver content alloy is used for braze welding, then adhesion and wettability characteristics are improved, but manufacturing cost increases
Solution Approach 1:
The invention changes the chemical composition parameters of the alloy by reducing silver content from traditional high levels (40-60%) to a controlled range (10-30%), while simultaneously optimizing other element concentrations (copper: 40-60%, zinc: 5-20%, plus controlled additions of锡, iron, silicon, chromium, phosphorus) to achieve the desired adhesion and wettability characteristics without relying on high silver content
Solution Approach 2:
The invention creates a composite alloy system that combines multiple elements (silver, copper, zinc, 锡, iron, silicon, chromium, phosphorus) in specific proportions to achieve synergistic effects, where the combination of elements provides both cost reduction and maintained welding performance, rather than relying on a single dominant element like traditional high-silver alloys
2Quantity of substance
If low silver content alloy is used, then manufacturing cost is reduced, but adhesion and wettability characteristics deteriorate
Solution Approach 1:
The invention systematically adjusts multiple compositional parameters simultaneously - reducing silver to 10-30% while optimizing copper to 40-60%, zinc to 5-20%, and adding controlled amounts of 锡 (0.1-5%), iron (0.1-5%), silicon (0.1-3%), chromium (0.1-2%), and phosphorus (0.1-2%) to collectively provide the adhesion and wettability that would otherwise require higher silver content
Solution Approach 2:
The invention introduces intermediate elements (particularly copper, zinc, and the minor additions of 锡, iron, silicon, chromium, phosphorus) that act as mediators to facilitate adhesion and wettability between the base metal and the alloy, compensating for the reduced silver content and maintaining reliable bonding characteristics
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 alloy achieves excellent mechanical properties and cost reduction by maintaining effective braze welding and adhesion performance with significantly lower silver content, suitable for industrial applications such as cutting tools, while maintaining compatibility with existing braze welding techniques.
Implementation Method 1
The weld metal penetrates between the pieces to be assembled by capillarity
Implementation Method 2
The latter, instead, exploits the capacity of liquid metals to rest on a surface with small contact angles
Data Source
AI summary
The invention concerns an alloy for braze welding, comprising 18% to 29% silver by weight, 12% to 30% zinc by weight, 0.2% to 5% manganese by weight, 0.001% to 5% nickel by weight, 0.001% to 5% indium by weight, optionally 0.001% to 6% tin, 0.001% to 4% iron by weight, 0.001 % to 3% silicon by weight, 0.001% to 2% chromium by weight, 0.001% to 2% phosphorus by weight and optionally other elements in quantities lower than 1% by weight, wherein the remaining percentage necessary to reach 100% by weight is constituted by copper. The alloy can be used to join components in sintered hard metal to other components in iron or steel, for example in cutting tools.