Copper-Manganese-Nickel Resistor Alloy for High Resistivity Formability
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Solution Overview
Problem
Nickel-chromium and iron-chromium based alloys face challenges in achieving high specific resistance and processability, with nickel-chromium alloys having low formability and magnetic properties, and iron-chromium alloys being less commonly used due to low processability.
Innovation Solution
A copper-manganese-nickel based alloy with specific resistance of 117 to 143 μΩ·cm, comprising 33 to 38% manganese and 8 to 15% nickel, optionally with up to 0.5% tin or iron, offering improved processability and characteristics similar to nickel-chromium alloys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nickel-chromium based alloys are used to achieve high specific resistance (117 to 143 μΩ·cm or more), then the specific resistance is improved, but the processability and formability deteriorate
Solution Approach 1:
The invention changes the compositional parameters by replacing nickel-chromium based alloy with copper-manganese-nickel based alloy having specific composition ranges (Mn: 33-38 mass%, Ni: 8-15 mass%, Cu: balance), thereby achieving high specific resistance (117-143 μΩ·cm) while improving processability and formability
Solution Approach 2:
The invention uses a composite alloy system combining copper, manganese, and nickel in specific proportions to create a new material that exhibits both high specific resistance and good processability, overcoming the limitations of conventional nickel-chromium based alloys
2Reliability
If iron-chromium based alloys are used to achieve high specific resistance (140 μΩ·cm or more), then the specific resistance is improved, but the processability deteriorates and magnetic properties become problematic
Solution Approach 1:
The invention changes the base material composition from iron-chromium to copper-manganese-nickel system, adjusting the compositional parameters to achieve high specific resistance while eliminating magnetic properties and improving processability through the copper-rich matrix
3Reliability
If copper-manganese-nickel based alloy with high specific resistance (117 to 143 μΩ·cm) is developed, then the specific resistance is improved, but the alloy composition complexity increases
Solution Approach 1:
The invention defines specific composition ranges (Mn: 33-38 mass%, Ni: 8-15 mass%, Cu: balance) that optimize the balance between specific resistance and processability, avoiding excessive complexity while achieving the desired electrical properties
Solution Approach 2:
The invention optimizes the local composition within the alloy system by controlling the distribution and concentration of manganese and nickel phases in the copper matrix, achieving high specific resistance in the resistive body while maintaining overall alloy processability
Data Source
AI summary
Provided is a copper-manganese-nickel based alloy having characteristics (in particular, specific resistance) close to those of a nickel-chromium based alloy. It is also an objective to provide an alloy having high processability compared to a nickel-chromium based alloy. An alloy for a resistive body includes copper, manganese, and nickel, wherein the manganese is 33 to 38% by mass, and the nickel is 8 to 15% by mass.