Core-Shell Cemented Carbide for Steel-Reactive Cutting Wear
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Solution Overview
Problem
Conventional cemented carbide materials with Ti-based compounds exhibit low resistance against reactivity with steel, limiting their effectiveness in cutting tools and wear-resistant applications.
Innovation Solution
Development of cemented carbide compositions featuring WC, TiNbWCN, and TiNbCN as hard-phase particles with a granular core and peripheral portion, where the composition of Nb, W, and N is optimized to enhance mechanical strength and resistance against reactivity with steel, including a method of manufacturing involving powder processing and sintering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Ti-based compounds are used in cemented carbide, then wear resistance is improved, but resistance against reactivity with steel deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters by replacing conventional Ti-based compounds with TiNbCN composite carbonitride, specifically controlling the atomic ratios of Ti, Nb, W, C, and N to achieve both wear resistance and low reactivity with steel
Solution Approach 2:
The invention uses composite carbonitride TiNbCN as a new hard phase material that combines multiple elements (Ti, Nb, W, C, N) to simultaneously achieve wear resistance and resistance against reactivity with steel, overcoming the limitations of single-element compounds
2Reliability
If composite carbonitride TiNbCN with specific composition is used, then resistance against reactivity with steel is improved, but manufacturing complexity increases
Solution Approach 1:
The invention performs preliminary classification of TiNbCN particles into core and peripheral portions with different compositions before sintering, which enables control of reactivity characteristics while maintaining a relatively simple overall manufacturing process using conventional sintering equipment
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 resulting cemented carbide exhibits improved mechanical strength, wear resistance, chipping resistance, and resistance against reactivity with steel, making it suitable for high-performance cutting tools.
Implementation Method 1
subjecting the granulated material to heat treatment at a temperature not lower than 1800° C. in an atmosphere containing nitrogen gas
Implementation Method 2
obtain a powder precursor composed of the composite carbonitride by subjecting the granulated material to heat treatment
Implementation Method 3
a fourth step of obtaining a sintered material by sintering the formed material
Data Source
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.