Multi-field Additive Manufacturing for Ceramic Components
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Solution Overview
Problem
Additive manufacturing techniques face challenges in controlling thermal gradients, leading to defects like cracks and pores, and surface quality issues in direct methods, while indirect methods require additional processing steps and introduce impurities, resulting in low efficiency.
Innovation Solution
A multi-field composite-based additive manufacturing device utilizing a sound field control module, microwave field/thermal field control module, and microprocessor to precisely control the bonding of ceramic powder, reducing thermal gradient issues and improving surface accuracy through non-contact powder transport and gradient microwave sintering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct laser sintering or melting method is used, then manufacturing efficiency is high and mechanical properties are improved, but thermal gradients cause cracks and poor surface quality
Solution Approach 1:
The forming process is segmented into two distinct stages: indirect forming with organic binder at lower temperature to build the green body, followed by direct sintering/melting to achieve final density and mechanical properties. This segmentation allows each stage to optimize for its specific function, avoiding the thermal gradient issues of direct methods while maintaining high efficiency.
Solution Approach 2:
The patent changes the temperature parameter dynamically during the process. The indirect forming stage operates at lower temperatures (avoiding severe thermal gradients), while the subsequent direct sintering/melting stage uses higher temperatures to achieve full density. This parameter change resolves the contradiction by applying different thermal regimes at different process stages.
2Reliability
If indirect forming method with organic binder is used, then temperature gradient is reduced and crack generation is minimized, but additional processing steps are required and production cycle is long
Solution Approach 1:
The patent merges the indirect forming and direct forming methods into a unified two-stage process. The green body from indirect forming serves as the substrate for subsequent direct sintering/melting, eliminating the need for separate processing steps and reducing the overall production cycle while maintaining crack control benefits.
Solution Approach 2:
The process maintains continuity by using the green body produced in the indirect forming stage as the direct input for the sintering/melting stage. This continuous workflow without intermediate handling or separate processing steps reduces time loss while preserving the crack-control advantages of indirect forming.
3Strength
If high temperature preheating is used to reduce thermal stress, then density and strength are improved, but molten pool expansion occurs and surface quality deteriorates
Solution Approach 1:
The patent applies preliminary action by performing indirect forming with organic binder at lower temperatures to create a green body structure that provides mechanical support and constraint during subsequent high-temperature sintering/melting. This preliminary structure prevents molten pool expansion and maintains surface accuracy even when high temperatures are used to achieve full density and strength.
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 surface accuracy and reduces defects by precisely controlling the bonding process, avoiding thermal gradient-related issues and enabling rapid, high-efficiency formation of complex ceramic components with improved mechanical properties.
Implementation Method 1
utilizing a sound field control module, microwave field/thermal field control module, and microprocessor to precisely control the bonding of ceramic powder
Implementation Method 2
gradient microwave sintering
Data Source
AI summary
The present invention belongs to the technical field related to additive manufacturing, and provides a multi-field composite-based additive manufacturing device and method. The device comprises a powder delivery adjustment module, a sound field control module, a microwave field/thermal field control module and a microprocessor. The powder delivery adjustment module, the sound field control module and the microwave field/thermal field control module are respectively connected to the microprocessor; the powder delivery adjustment module comprises a raw material dispersion chamber, and the raw material dispersion chamber is provided within a forming cavity formed by a housing; the sound field control module is also provided within the forming cavity and is located below the raw material dispersion chamber; the microwave field/thermal field control module comprises a plurality of microwave generators provided in the forming cavity, the plurality of microwave generators are respectively located at two sides of a forming area.