Core-Shell Cemented Carbide Composition for Steel-Reactive Wear
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Solution Overview
Problem
Existing cemented carbides with Ti-based compounds have inadequate resistance against reactivity with steel, limiting their mechanical strength and wear resistance.
Innovation Solution
The development of cemented carbide compositions featuring TiNbWCN and TiNbCN as source materials, with specific atomic ratios and microstructural configurations of WC, carbonitride, and an iron-group binder phase, enhancing mechanical strength and resistance against steel reactivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If Mo is added to composite carbonitride to improve mechanical strength, then hardness and wear resistance are enhanced, but resistance against reactivity with steel deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by replacing Mo with Nb in the composite carbonitride structure. Specifically, it uses TiNbWCN and TiNbCN compounds where Nb provides both the desired mechanical strength enhancement and improved resistance against reactivity with steel, thus resolving the contradiction through parameter optimization
Solution Approach 2:
The patent employs composite carbonitride materials containing Ti, Nb, W, C, and N in specific ratios. The composite structure of TiNbWCN and TiNbCN combines the benefits of multiple elements: Ti for base strength, Nb for enhanced mechanical properties and reduced steel reactivity, W for hardness, and controlled C:N ratios for overall performance optimization
2Strength
If Ti-based compounds are used in cemented carbide, then wear resistance is improved, but resistance against reactivity with steel is insufficient
Solution Approach 1:
The patent modifies the Ti-based compound composition by incorporating specific ratios of Nb and W along with controlled carbonitride content. The atomic ratios of C and N are precisely controlled (C: 0.4-0.6, N: 0.4-0.6) to achieve optimal balance between wear resistance and reduced steel reactivity
Solution Approach 2:
The patent creates a composite material system where TiNbWCN and TiNbCN compounds are combined with WC and an iron-group binder phase. This composite structure leverages the synergistic effects of different materials: TiNbWCN/TiNbCN for wear resistance and reduced steel reactivity, WC for hardness, and the iron-group binder for toughness and binding
Data Source
Figure 1
AI summary
Cemented carbide contains first hard-phase particles containing WC, second hard-phase particles which contain carbonitride containing at least Ti and Nb, and a metallic binder phase containing an iron-group element. The second hard-phase particle includes a granular core portion and a peripheral portion which covers at least a part of the core portion. The core portion contains composite carbonitride expressed as Ti1-X-YNbXWYC1-ZNZ, where Y is not smaller than 0 and not greater than 0.05 and Z is not smaller than 0.3 and not greater than 0.6. The peripheral portion is different in composition from the core portion.