Oxide Ceramic Molded Body Vacuum Pressing
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Solution Overview
Problem
Existing methods for manufacturing oxide ceramic molded bodies with nano-sized particles face challenges such as chipping, cracking, and low production yield due to air entrapment and the high specific surface area of these particles.
Innovation Solution
A method involving press molding of oxide ceramic particles with an average primary particle diameter of 1 to 120 nm under reduced pressure, which reduces air entrapment and enhances the yield of the molded bodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniaxial pressing is used to mold nano-sized oxide ceramic particles, then the molded body can be formed, but air remains trapped inside causing chipping and cracking
Solution Approach 1:
The patent applies vacuum pressing (pneumatic principle) to remove air from the powder before molding. By creating a vacuum environment during pressing, air is evacuated from the interstices between nano-sized particles, preventing air entrapment that would otherwise cause chipping and cracking during sintering. This resolves the contradiction by using pneumatic principles to improve molded body quality while maintaining ease of manufacture.
2Strength
If nano-sized particles with small average primary particle diameter are used, then high translucency and strength are achieved, but specific surface area increases causing air entrapment and low production yield
Solution Approach 1:
The patent applies preliminary vacuum treatment before molding to remove air from the powder. By performing this air removal action in advance, the subsequent molding process proceeds without air entrapment issues, preventing defects that would lead to rejected products. This preliminary action resolves the productivity issue by ensuring high first-pass yield while maintaining the use of nano-sized particles for high strength.
3Device complexity
If conventional press molding is used, then the process is simple, but chipping and cracking occur during pre-sintering and sintering
Solution Approach 1:
The patent changes the pressure parameter by applying vacuum (reducing pressure) during the molding process. This parameter change from atmospheric pressure to vacuum pressure enables air removal while maintaining a relatively simple pressing device configuration. The modified pressure condition prevents air entrapment and subsequent defects, resolving the contradiction between device simplicity and manufacturing precision.
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 method significantly reduces chipping and cracking during pre-sintering and sintering, enabling high-yield production of oxide ceramic molded bodies with improved translucency and strength.
Implementation Method 1
press molding of oxide ceramic particles with an average primary particle diameter of 1 to 120 nm under reduced pressure
Data Source
AI summary
The present invention provides a method for manufacturing an oxide ceramic molded body that enables high-yield production of a molded body in a convenient fashion using a powder of oxide ceramic particles having a nano-sized average primary particle diameter (particularly, 120 nm or less). The present invention relates to a method for manufacturing an oxide ceramic molded body, comprising subjecting a powder containing oxide ceramic particles with an average primary particle diameter of 1 to 120 nm to press molding under reduced pressure. Preferably, the press molding is conducted under a reduced pressure of 0.1 to 100 kPa.