Spinel Oxide Sintered Body Densification at 600°C or Lower
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Solution Overview
Problem
Existing methods for manufacturing high-density sintered bodies of metal oxides with a spinel-type structure require high temperatures, which are costly and inefficient.
Innovation Solution
A method involving mixing metal oxide particles with metal acetylacetonate and heating under pressure at a temperature of the melting point or higher of the acetylacetonate and 600°C or lower to form a high-density sintered body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-temperature sintering (800°C or higher) is used to achieve high density of metal oxide particles, then the density and strength of the sintered body are improved, but the manufacturing cost increases significantly
Solution Approach 1:
The invention changes the sintering temperature parameter from conventional high temperature (800°C or higher) to low temperature (600°C or lower) by introducing metal acetylacetonate as a sintering aid. This parameter change enables the formation of high-density sintered bodies at reduced temperatures, directly resolving the contradiction between density improvement and manufacturing cost reduction
Solution Approach 2:
Metal acetylacetonate serves as an intermediary substance that facilitates low-temperature sintering. It forms a eutectic mixture with the metal oxide particles, creating a liquid phase that enables particle bonding at lower temperatures. This intermediary allows the sintering process to occur at 600°C or lower while still achieving high density, thus resolving the cost-density contradiction
2Strength
If conventional sintering methods are used for metal oxide particles with spinel-type structure, then high density can be achieved, but the sintering temperature must be very high (800°C or higher)
Solution Approach 1:
The invention utilizes phase transition by forming a eutectic liquid phase between metal acetylacetonate and metal oxide particles during sintering. This liquid phase forms at temperatures of 600°C or lower, enabling particle bonding and densification through liquid-phase sintering mechanisms rather than solid-state diffusion, thus achieving high density at reduced temperatures
Solution Approach 2:
The invention creates a composite system consisting of metal oxide particles and metal acetylacetonate. This composite approach allows the acetylacetonate to modify the sintering behavior of the metal oxide, enabling low-temperature processing while maintaining the structural integrity and high density of the final 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 and high-strength sintered bodies at lower temperatures, with an amorphous phase acting as an adhesive layer to prevent peeling and enhance structural integrity.
Implementation Method 1
heating the mixture under pressure at a temperature of a melting point or higher of the metal acetylacetonate
Implementation Method 2
an amorphous phase interposed among the first plurality of particles of the metal oxide, the amorphous phase containing at least one metal element
Implementation Method 3
heating the mixture under pressure at a temperature of a melting point or higher of the metal acetylacetonate and 600°C or lower
Data Source
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AI summary
The present invention provides 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 a melting point or higher of the metal acetylacetonate and 600°C or lower, to form a sintered body that contains the metal oxide having the spinel-type structure. Further, the present invention provides a structure manufactured by the method, and a composite structure formed by joining the structure and a base material together with a joining layer.