Spinel Oxide Sintered Bodies With Low-Temperature Amorphous Bonding
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Solution Overview
Problem
Conventional high-temperature sintering methods for producing high-density sintered bodies containing metal oxides with a spinel-type structure are costly and inefficient, and there is a need for a method to achieve high density and strength at lower temperatures.
Innovation Solution
A method involving mixing metal oxide particles with metal acetylacetonate and heating under pressure at temperatures between the melting point of the acetylacetonate and 600°C to form a high-density sintered body, utilizing an amorphous phase as an adhesive layer to enhance strength and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-temperature sintering (800°C or higher) is used to produce high-density sintered bodies, then density and strength are improved, but manufacturing cost increases significantly
Solution Approach 1:
The invention changes the sintering temperature parameter from conventional high temperatures (800°C or higher) to low temperatures (200°C or lower), making the manufacturing process more cost-effective while maintaining high density through the use of metal acetylacetonate and pressure application
Solution Approach 2:
The invention uses a composite system combining metal oxide particles with metal acetylacetonate, where the acetylacetonate acts as a binding agent that enables low-temperature sintering while achieving high density, thus reducing manufacturing costs without sacrificing strength
2Quantity of substance
If high-temperature sintering is used to achieve high density, then density is improved, but energy consumption increases
Solution Approach 1:
The invention changes the temperature parameter from 800°C or higher to 200°C or lower, dramatically reducing energy consumption while achieving high density through the combined effect of metal acetylacetonate and pressure application during sintering
3Ease of manufacture
If conventional sintering methods are used for spinel-type metal oxides, then manufacturing process is simple, but adhesion strength is insufficient and peeling occurs
Solution Approach 1:
The invention uses metal acetylacetonate as a composite binding agent that forms an amorphous phase during low-temperature sintering, creating strong adhesion between particles and preventing peeling while maintaining process simplicity
Solution Approach 2:
The metal acetylacetonate undergoes phase transition during heating, forming an amorphous phase that acts as an adhesive layer between metal oxide particles, significantly improving adhesion strength and preventing peeling in the sintered body
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 enables the production of high-density, high-strength sintered bodies with improved characteristics, including enhanced adhesion and reduced peeling, at lower temperatures compared to conventional methods.
Implementation Method 1
heating the mixture under pressure at a temperature of from a melting point or higher of the metal acetylacetonate
Implementation Method 2
utilizing an amorphous phase as an adhesive layer to enhance strength and adhesion
Implementation Method 3
an amorphous phase interposed among the first plurality of particles of the metal oxide, the amorphous phase containing at least one metal element
Data Source
AI summary
A method for manufacturing a sintered body, the method including heating a mixture that contains a plurality of particles of a metal oxide having a spinel-type structure, and a metal acetylacetonate under pressure at a temperature of from a melting point or higher of the metal acetylacetonate to 600° C. or lower, to form a sintered body that contains the metal oxide having the spinel-type structure.