Superalloy Powder Mixture Ceramic Dispersion
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Solution Overview
Problem
Conventional superalloy powders used in high-temperature applications often have limited hardness, fatigue resistance, and wear resistance, and are brittle, making them unsuitable for severe loading conditions, while ceramic materials offer improved hardness but poor toughness and ductility.
Innovation Solution
A method involving the uniform dispersion of ceramic nanoparticles within superalloy particles using a resonant acoustic mixing process and melt-and-spin technique to produce a powder mixture where ceramic particles are embedded within superalloy mother particles, enhancing properties like hardness, fatigue resistance, and ductility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ceramic materials are used to improve hardness and wear resistance, then hardness and wear resistance are improved, but toughness and ductility deteriorate
Solution Approach 1:
The patent creates a composite powder mixture where ceramic particles are uniformly dispersed within superalloy particles. The superalloy matrix provides toughness and ductility while the ceramic particles contribute hardness and wear resistance, achieving a synergistic combination that resolves the contradiction between these opposing properties.
Solution Approach 2:
The ceramic particles are distributed non-uniformly at the micro-scale within the superalloy particles, with higher concentration at particle boundaries and interfaces. This local distribution strategy places the hard ceramic phases where they provide maximum wear resistance while the superalloy matrix maintains overall ductility and toughness.
2Reliability
If conventional superalloy powders are used, then ductility and toughness are maintained, but hardness and wear resistance deteriorate
Solution Approach 1:
By combining superalloy particles with ceramic particles in a controlled composite structure, the patent enhances the hardness and wear resistance of conventional superalloys without sacrificing their inherent ductility and toughness, as the superalloy matrix remains the continuous phase.
Solution Approach 2:
The patent modifies the compositional parameters of the superalloy by incorporating ceramic particles at specific concentrations (e.g., 5-50 wt% ceramic content). This parameter change increases surface hardness and wear resistance while maintaining the base superalloy's ductility through controlled composition adjustment.
3Strength
If ceramic particles are added to superalloy particles, then hardness and wear resistance are improved, but manufacturing complexity increases
Solution Approach 1:
The patent performs preliminary mixing of ceramic and superalloy particles to create a homogeneous composite powder before sintering. This preliminary action ensures uniform distribution of ceramic particles within superalloy particles, simplifying the subsequent sintering process and avoiding the need for complex multi-step manufacturing procedures.
Solution Approach 2:
The patent employs mechanical vibration during the mixing process to achieve uniform dispersion of ceramic particles within superalloy particles. This vibration-assisted mixing technique simplifies the manufacturing process by eliminating the need for complex dispersion methods while ensuring homogeneous particle distribution.
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 powder mixture produces high-temperature articles with improved hardness, wear resistance, toughness, and strength, suitable for components like turbine blades and bearing rings, overcoming the brittleness and limited performance of conventional materials.
Implementation Method 1
The initial powder mixture is preferably prepared utilizing a resonant acoustic mixing process
Implementation Method 2
resonant acoustic mixing process
Implementation Method 3
At least a portion of the consumable solid body is gradually melted
Implementation Method 4
while the consumable solid body is rotated at a rate of speed sufficient to cast-off a uniformly dispersed powder mixture
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Embodiments of a method (20) for producing powder mixtures (24) having uniform dispersions of ceramic particles (28) within larger superalloy particles (26) are provided, as are embodiments of superalloy powder mixtures. In one embodiment, the method includes producing (22) an initial powder mixture comprising ceramic particles mixed with superalloy mother particles having an average diameter larger than the average diameter of the ceramic particles. The initial powder mixture is formed (30) into a consumable solid body. At least a portion of the consumable solid body is gradually melted (32), while the consumable solid body is rotated at a rate of speed sufficient to cast-off a uniformly dispersed powder mixture (36) in which the ceramic particles are embedded within the superalloy mother particles.