Cemented Carbide Composite With Gamma-Phase Interlayer for Joint Strength
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Solution Overview
Problem
Existing cemented carbide materials suffer from insufficient high-temperature strength and are prone to breakage and peeling due to dimensional changes during electric-current pressure sintering and coating film limitations.
Innovation Solution
A cemented carbide composite material comprising a WC- Co-based cemented carbide part, a substrate part made of Ni or Co, and an intermediate layer with a gamma phase fraction of 80% or more and Vickers hardness less than 700 HV, formed through additive manufacturing and heat treatment to enhance joint strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If coating film is applied to improve mechanical property, then hardness and wear resistance are improved, but high-temperature strength becomes insufficient
Solution Approach 1:
The invention uses a composite material structure consisting of a cemented carbide part (WC-Co) and a non-cemented carbide part (Ni or Co-based) bonded together. This composite structure combines the high hardness and wear resistance of cemented carbide with the high ductility and high-temperature strength of non-cemented carbide, resolving the contradiction between mechanical property improvement through coating and high-temperature strength sufficiency.
2Strength
If electric-current pressure sintering is used to bond cemented carbide and steel, then bonding is achieved, but breakage and peeling occur due to dimensional change
Solution Approach 1:
The invention changes the bonding parameters by using conventional sintering or diffusion bonding instead of electric-current pressure sintering. This parameter change avoids the rapid heating and cooling that causes excessive dimensional changes and subsequent breakage or peeling, while still achieving strong bonding between the cemented carbide part and the non-cemented carbide part.
3Ease of manufacture
If Ni insert material is used to bond cemented carbide and steel, then cost is reduced and abrasion resistance is improved, but joint strength becomes insufficient
Solution Approach 1:
The invention changes the thickness parameter of the Ni insert material to a specific range (0.1 mm or more and 0.5 mm or less) and controls the Co content in the cemented carbide (40 weight % or less). These parameter changes optimize the balance between cost, abrasion resistance, and joint strength, achieving sufficient joint strength while maintaining cost-effectiveness.
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 composite material achieves high-temperature strength and suppresses breakage and peeling, enabling long-lasting tools with improved toughness and reduced stress during thermal cycling.
Implementation Method 1
the intermediate layer including a part having a gamma phase fraction of 80% or more and having Vickers hardness less than 700 HV
Implementation Method 2
formed through additive manufacturing and heat treatment to enhance joint strength
Data Source
AI summary
Provided is a cemented carbide composite material including cemented carbide and non-cemented carbide having better high-temperature strength than conventional materials and capable of suppressing breakage and peeling of the composite material. A cemented carbide composite material includes: a cemented carbide part including WC—Co-based cemented carbide; a substrate part including metal that contains at least one of Ni and Co that accounts for 50 mass % or more in total. This cemented carbide composite material has an intermediate layer between the cemented carbide composite material and the substrate part, the intermediate layer containing components of the cemented carbide part and components of the substrate part. The intermediate layer includes a part having a gamma phase fraction of 80% or more and having Vickers hardness less than 700 HV.