Oriented Sintered Body via Template-Guided Particle Arrangement
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Solution Overview
Problem
The existing methods for producing oriented sintered bodies, such as TGG, require large shearing forces and complex apparatuses, making the process cumbersome and inefficient.
Innovation Solution
A method involving the alternate stacking of fine and plate-like raw-material powder layers, where the plate-like particles are arranged to extend along the surface of the fine powder layers, eliminating the need for high shearing forces and allowing for simpler apparatus design, followed by sintering to produce an oriented sintered body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tape casting method is used to arrange plate-like raw-material particles in a specific manner, then oriented sintered body can be produced, but considerably large shearing force is required which increases apparatus size and complexity
Solution Approach 1:
The invention divides the raw-material particles into two distinct types: fine raw-material particles and plate-like template particles. The plate-like particles are arranged in a specific pattern on the green compact surface before sintering, serving as templates that guide the orientation of the fine particles during sintering. This segmentation allows the orientation function to be performed by the template particles alone, eliminating the need for large shearing forces in the tape casting process.
Solution Approach 2:
The plate-like template particles are prearranged in a specific pattern on the green compact surface before the sintering process begins. This preliminary arrangement establishes the orientation template that will be replicated during sintering, eliminating the need for complex shearing operations during the main processing step. The orientation information is prepared in advance and carried through the sintering process.
2Manufacturing precision
If casting speed is increased to apply sufficient shearing force, then particle arrangement is improved, but drying time must be extended to prevent insufficient drying which increases production time
Solution Approach 1:
By separating the functions of particle arrangement and sintering, the invention allows the plate-like template particles to be arranged during tape casting at normal speeds, while the orientation function is performed during sintering through the template effect. This eliminates the need to increase casting speed to achieve particle arrangement, thereby avoiding the associated drying time extension.
Solution Approach 2:
The invention replaces the mechanical shearing force system with a template-guided self-arrangement system. Instead of using mechanical force to force particles into position, the plate-like template particles provide a geometric template that guides the fine particles into the correct orientation during sintering, eliminating the need for high-speed casting and extended drying.
3Manufacturing precision
If large shearing force is applied during tape casting, then plate-like particles are arranged in specific manner, but apparatus size must be increased to accommodate the shearing mechanism
Solution Approach 1:
The invention segments the particle population into fine raw-material particles and plate-like template particles with distinct functions. The plate-like particles serve as orientation templates and are arranged during standard tape casting without requiring enhanced shearing mechanisms. This segmentation allows standard apparatus size to suffice while achieving precise particle arrangement through the template effect during sintering.
Solution Approach 2:
The invention replaces the mechanical shearing force system with a template-guided self-arrangement mechanism. The plate-like template particles provide geometric guidance that eliminates the need for high-speed casting and extensive shearing, thereby reducing the requirements for apparatus size and complexity while maintaining precise particle arrangement.
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
This approach enables the production of oriented sintered bodies with high degrees of c-plane orientation and small tilt angles, achieving comparable or superior results to TGG without the need for large shearing forces or complex equipment, thus simplifying the process and reducing apparatus size.
Implementation Method 1
homoepitaxial growth is performed while the fine raw-material particles are incorporated into the plate-like raw-material particles during sintering
Implementation Method 2
sintering the multilayer body
Data Source
AI summary
A method for producing an oriented sintered body according to the present invention includes the steps of: (a) preparing a multilayer body, the multilayer body including a layer including a fine raw-material powder and a layer including a plate-like raw-material powder which are alternately stacked each other, particles of the plate-like raw-material powder being arranged such that surfaces of the particles of the plate-like raw-material powder extend along a surface of the layer including a fine raw-material powder; and (b) sintering the multilayer body.