Hydrophobic Metal Powder Coating for Humidity-Stable 3D Printing
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Solution Overview
Problem
The fluidity of surface-treated metal powders used in additive manufacturing decreases under high temperature and humidity conditions, leading to reduced mechanical strength and dimensional accuracy of additively manufactured bodies.
Innovation Solution
A metal powder with a film containing a compound derived from a coupling agent having a hydrophobic functional group, with an average particle diameter of 3.0 μm to 30.0 μm and a contact angle of water between 80° and 150°, which maintains high fluidity and affinity for binders even in high temperature and humidity environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface treatment with coupling agent is applied to metal powder, then conductivity during lamination is improved, but fluidity decreases under high temperature and high humidity
Solution Approach 1:
The patent applies a composite coating structure on metal powder particles consisting of multiple layers with different functions. The inner layer contains coupling agents for conductivity, while the outer layer contains hydrophobic compounds to maintain fluidity under high temperature and humidity. This composite structure resolves the contradiction by combining materials with complementary properties.
Solution Approach 2:
The patent modifies the chemical composition parameters of the surface treatment by introducing hydrophobic functional groups (such as long-chain alkyl groups, aromatic hydrocarbon groups, or fluorine-containing groups) to the coupling agent structure. This parameter change allows the material to maintain both conductivity and fluidity under adverse environmental conditions.
2Ease of operation
If fluidity of metal powder is improved, then filling property is enhanced, but mechanical strength and dimensional accuracy may be reduced
Solution Approach 1:
The patent optimizes the contact angle parameter of the metal powder surface to a specific range (20° to 80°) through controlled surface treatment. This parameter optimization ensures adequate fluidity for good filling while preventing excessive fluidity that could compromise dimensional accuracy and mechanical strength.
Solution Approach 2:
The patent applies surface treatment with specific local properties to the metal powder particles. The treatment creates a surface layer with controlled hydrophobicity and adhesion characteristics, providing local quality enhancement that improves filling without negatively affecting the overall structural integrity and dimensional precision of the sintered product.
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 solution enhances the mechanical strength and dimensional accuracy of additively manufactured bodies by maintaining powder fluidity and improving binder permeation, resulting in high-quality metal sintered bodies.
Implementation Method 1
a film provided on a particle surface of the metal powder and containing a compound derived from a coupling agent having a hydrophobic functional group
Implementation Method 2
in a state where the additive manufacturing powder is subjected to a heating treatment at 200° C. for 24 hours in an air atmosphere
Data Source
AI summary
An additive manufacturing powder includes: a metal powder; and a film provided on a particle surface of the metal powder and containing a compound derived from a coupling agent having a hydrophobic functional group. An average particle diameter is 3.0 μm or more and 30.0 μm or less, and a contact angle of water measured at 25° C. by a θ/2 method, in a state where the additive manufacturing powder is subjected to a heating treatment at 200° C. for 24 hours in an air atmosphere and then laid in layers, is 80° or more and 150° or less.