Hierarchical Wear Part with Ceramic Inserts
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Solution Overview
Problem
Existing wear parts in ore extraction and processing face challenges in achieving high concentrations of ceramic reinforcement in stressed areas due to the requirement of sufficient interstices for infiltration during casting, limiting their effectiveness in withstanding impact and abrasion resistance.
Innovation Solution
A hierarchical wear part design featuring prefabricated ceramic inserts with a predefined geometry embedded in a three-dimensional structure of millimetric grains, where the inserts are bonded in a first metal matrix independent of the casting alloy, allowing for high ceramic concentrations and improved wear resistance by infiltrating the structure with a second metal matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a three-dimensional structure of aggregated millimetric grains is used for reinforcement, then the reinforcement structure can be fully infiltrated by the ferrous alloy during casting, but the concentration of ceramics in the reinforced areas is limited due to the requirement of sufficient interstices
Solution Approach 1:
The reinforcement structure is segmented into two distinct components: (1) a three-dimensional structure of aggregated millimetric grains providing the infiltration framework, and (2) separate ceramic particles or ceramic-coated grains that can be concentrated in specific regions. This segmentation allows the infiltration function and ceramic concentration function to be independently optimized without mutual interference.
Solution Approach 2:
The patent applies local quality by concentrating ceramic particles or ceramic-coated grains in specific reinforced areas of the wear part, rather than distributing them uniformly. This allows high ceramic concentration in the most stressed regions while maintaining sufficient interstices in other areas for complete infiltration during casting.
2Strength
If high concentration of ceramic particles is achieved in reinforced areas, then wear resistance is improved, but the casting infiltration process becomes problematic due to insufficient interstices
Solution Approach 1:
The patent applies preliminary action by pre-positioning ceramic particles or ceramic-coated grains in the mold before casting. This allows the ceramic reinforcement to be concentrated in the desired locations prior to infiltration, while the liquid ferrous alloy can still penetrate through the remaining interstices to bind the ceramic particles together.
Solution Approach 2:
The patent uses an intermediary approach by introducing a binding agent or matrix material that facilitates both the concentration of ceramic particles and the infiltration process. This intermediary component allows high ceramic concentration to coexist with sufficient permeability for casting infiltration.
3Manufacturing precision
If prefabricated inserts with defined geometry are integrated into the reinforcement structure, then positioning precision is improved, but the structural complexity increases
Solution Approach 1:
The reinforcement structure is segmented into modular components: prefabricated inserts with defined geometry and the surrounding three-dimensional structure of aggregated millimetric grains. This segmentation allows each component to be manufactured independently with high precision, then assembled together, reducing the overall structural complexity while maintaining positioning accuracy.
Solution Approach 2:
The patent applies preliminary action by pre-manufacturing the prefabricated inserts with defined geometry before integrating them into the reinforcement structure. This allows precise positioning to be achieved during the final assembly stage rather than requiring complex precision throughout the entire structure, thereby reducing overall structural complexity.
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 solution enhances wear resistance by achieving high ceramic concentrations in the most stressed areas, improving the performance of wear parts in ore extraction and processing equipment by maintaining a balance between hardness and toughness, reducing wear and extending operational life.
Implementation Method 1
the millimetric interstices of the reinforcement are infiltrated during the casting by a second metal matrix
Data Source
AI summary
The present disclosure relates to a hierarchical wear part including a reinforced portion comprising zirconia or an alumina-zirconia alloy. The reinforced portion also includes centimetric inserts with a predefined geometry. The inserts include micrometric particles of metal carbides, nitrides, borides, or intermetallic compounds bonded by a first metal matrix. The inserts are inserted into a reinforcement structure infiltrated by a second metal matrix, the reinforcement structure having a periodic alternation of millimetric areas of high and low concentration of micrometric particles of zirconia or alumina-zirconia alloy. The second metal matrix is different from the first metal matrix.