Heat-Resistant Sintered Material for Wear and Salt Damage Resistance
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Solution Overview
Problem
Existing heat-resistant sintered materials for turbocharger components face challenges in achieving both wear resistance and salt damage resistance while maintaining oxidation resistance, as high chromium content leads to brittleness and decreased strength, and ceramic particles lack bonding force with the matrix, resulting in poor wear resistance under high loads.
Innovation Solution
A heat-resistant sintered material with a composition of Cr: 15% to 30%, Ni: 8% to 30%, Si: 2.0% to 6.0%, C: 0.5% to 2.5%, and B: 0.08% to 0.8% is developed, featuring a dense structure with hard phases of Fe, Cr, and C dispersed in a matrix of Fe, Cr, Ni, and Si, which enhances strength and wear resistance while maintaining oxidation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ceramic particles are added to improve salt damage resistance, then salt damage resistance is improved, but bonding force with matrix decreases and wear resistance deteriorates
Solution Approach 1:
The patent optimizes the particle size parameter of ceramic additives, controlling them to have an average diameter of 10 μm or less. This fine particle size optimization improves salt damage resistance while maintaining sufficient bonding strength and wear resistance, resolving the contradiction between salt damage resistance and wear resistance.
Solution Approach 2:
The patent creates a heterogeneous microstructure where ceramic particles are selectively distributed in specific phases (primarily in the martensite phase rather than austenite phase). This local quality differentiation allows ceramic particles to provide salt damage resistance in critical areas without compromising the overall wear resistance of the material.
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 material achieves excellent salt damage resistance and wear resistance while maintaining oxidation resistance, suitable for components exposed to high-temperature corrosive exhaust gases, ensuring durability and sliding characteristics in turbocharger applications.
Implementation Method 1
The material achieves excellent salt damage resistance and wear resistance while maintaining oxidation resistance
Implementation Method 2
The material achieves excellent salt damage resistance and wear resistance
Implementation Method 3
The material achieves excellent salt damage resistance and wear resistance
Data Source
Figure 1~2
Figure 3
AI summary
This heat-resistant sintered material has, as an overall composition, a composition including, in terms of % by mass, Cr: 15% to 30%, Ni: 8% to 30%, Si: 2.0% to 6.0%, and C: 0.5% to 2.5% with a remainder being Fe and inevitable impurities, wherein the heat-resistant sintered material has a structure in which hard phases are dispersed in a matrix, the matrix includes Fe, Cr, Ni, and Si, the hard phase includes Fe, Cr, and C, and a porosity is 2.0% or less.