Cemented Carbide Binder Phase Reinforcement for High-Temperature Wear
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Solution Overview
Problem
Cemented carbide materials with metallic binders suffer from reduced strength at high temperatures, leading to increased abrasive wear and extrusion of tungsten carbide grains due to the thermal instability of nanoparticles in the binder phase, limiting their suitability for high-temperature applications.
Innovation Solution
Incorporating intermetallic phase material into the binder phase, specifically through thermal treatment, to reinforce the binder phase, enhancing its strength and stability at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If nanoparticles are formed in the binder phase to enhance hardness, then the hardness of the cemented carbide material increases, but the thermal stability of the binder phase deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the binder phase by adding specific elements (Cr, Mn, Mo, Nb, Ta, Ti, V, Zr) to form stable intermetallic compounds. This transforms the binder phase from a simple metallic matrix to a complex intermetallic system that maintains stability at high temperatures while preserving hardness enhancement from nanoparticle formation.
Solution Approach 2:
The patent creates a composite binder phase structure combining metallic binder material with intermetallic phase material. This composite structure integrates the hardness-enhancing nanoparticles with thermally stable intermetallic compounds, achieving both improved hardness and thermal stability simultaneously.
2Reliability
If the metallic binder strength is increased to prevent extrusion at high temperatures, then wear resistance improves, but the complexity of the binder composition increases
Solution Approach 1:
The patent modifies the binder composition parameters by incorporating multiple alloying elements that form intermetallic phases. These compositional changes enhance the binder's strength and wear resistance at high temperatures, accepting increased compositional complexity as a necessary trade-off for improved performance.
Solution Approach 2:
The patent creates local regions of intermetallic phase material within the binder phase, concentrating strength-enhancing properties where needed. This localized reinforcement approach improves wear resistance without requiring uniform complexity throughout the entire material structure.
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 reinforced binder phase significantly increases wear resistance and fracture strength, with up to 50% improvement in wear resistance observed in road milling applications, and maintains structural integrity under high mechanical and thermal stress.
Implementation Method 1
the elements Ni, Co, W and Al from the binder phase combine to form the intermetallic phase material
Implementation Method 2
thermal treatment of the cemented carbide material can be performed in different ways, which are suitable for forming the intermetallic phase material as intended
Data Source
AI summary
The invention relates to a cemented carbide material, in particular hard metal, containing 70 to 95 wt %, preferably containing 80 to 95 wt %, tungsten carbide in dispersed form, and a binder phase, wherein the binder phase comprises metallic binder material, wherein the metallic binder material comprises Co, wherein the binder phase comprises intermetallic phase material and/or the dissolved elements Ni and Al, wherein the intermetallic phase material, if present, is formed according to the structural formula (M, Y)3 (Al, X), wherein M=Ni, Y═Co and/or another constituent and X=tungsten and/or another constituent, wherein the binder phase has the chemical element composition listed below: Ni>25 wt %, Al>4 wt %, the balance is made up of Co and dissolved binder constituents, for instance W and/or C. Such a cemented carbide material, is characterized by a high wear resistance and at the same time a high fracture strength.