Supportive Coating Agent for 3D Printed Metal Parts
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Solution Overview
Problem
Three-dimensional printed articles made with metal particles often deform during heat-fusing due to the burn-off of binding agents, especially in areas subjected to gravitational and mechanical forces.
Innovation Solution
A three-dimensional printing kit and method that includes a particulate build material with 80-100 wt% metal particles, a binding agent, and a supportive coating agent containing ceramic particles with a negative coefficient of thermal expansion, a gelling compound, and a liquid vehicle. The method involves iteratively applying build material layers and binding agents, coating with the supportive agent, and heat-fusing to form a stable three-dimensional object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If binding agents are used to bind build materials together in three-dimensional printing, then the green body object can be formed and handled, but deformation occurs during heat-fusing due to burn-off of the binding agents
Solution Approach 1:
A supportive coating is applied to the green body object before heat-fusing to prevent deformation. The coating is prepared by mixing ceramic particles with a gelling compound and liquid vehicle, then coating the green body object and allowing it to dry, forming a protective layer that maintains structural integrity during the burn-off process
Solution Approach 2:
The supportive coating acts as an intermediary between the green body object and the heat-fusing process. The coating contains ceramic particles that provide structural support and a gelling compound that binds the particles together, creating a protective matrix that prevents deformation while allowing the binding agent to burn off
2Strength
If heat-fusing is performed at high temperature to fuse metal particles, then strong three-dimensional objects are produced, but the binding agents burn off causing deformation
Solution Approach 1:
The supportive coating is applied beforehand to prevent deformation before it occurs during high-temperature heat-fusing. The coating maintains the object's shape while the binding agent burns off and metal particles fuse together
Solution Approach 2:
The coating undergoes parameter changes during heating - the liquid vehicle evaporates and the gelling compound sets, transforming from a liquid slurry to a solid protective coating that can withstand the heat-fusing temperatures
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 use of a supportive coating agent prevents deformation of the green body object during heat-fusing, maintaining the structural integrity of the three-dimensional printed articles.
Implementation Method 1
The supportive coating agent can include ceramic particles having a negative coefficient of thermal expansion, a gelling compound, and a liquid vehicle
Implementation Method 2
The supportive coating agent can include ceramic particles having a negative coefficient of thermal expansion
Implementation Method 3
heating the green body object to a metal particle-fusing temperature that is higher than the coating-hardening temperature to form a heat-fused three-dimensional object
Data Source
AI summary
A three-dimensional printing kit can include a particulate build material, a binding agent, and a supportive coating agent. The particulate build material can include from about 80 wt % to about 100 wt % metal particles based on the total weight of the particulate build material. The binding agent can include binder particles dispersed in a binder liquid vehicle. The supportive coating agent can include ceramic particles having a negative coefficient of thermal expansion, a gelling compound, and a supportive coating liquid vehicle.