Ceramic Sintering Aid Composition for Low-Temperature Processing
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Solution Overview
Problem
Conventional ceramic compositions, such as gehlenite, have a high melting point, limiting their effectiveness in reducing sintering temperatures and increasing the cost of manufacturing ceramic workpieces with higher density.
Innovation Solution
A ceramic composition comprising specific ratios of magnesium oxide (MgO), aluminum oxide (Al2O3), silicon dioxide (SiO2), calcium oxide (CaO), ferric oxide (Fe2O3), sulfur trioxide (SO3), and titanium oxide (TiO2), with optional alkali metal oxides, which significantly lowers the melting point and enhances bulk density when used as a sintering aid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional ceramic composition (gehlenite) is used as sintering aid, then the ceramic workpiece achieves high density, but the sintering temperature must be maintained at high level (around 1550°C)
Solution Approach 1:
The patent changes the chemical composition parameters of the sintering aid by incorporating specific ratios of MgO (1-8 mol%), Al2O3 (5-15 mol%), SiO2 (25-40 mol%), CaO (40-55 mol%), Fe2O3 (0.1-8 mol%), SO3 (0.1-2 mol%), and TiO2 (0.1-2 mol%). This compositional parameter change reduces the melting point from 1550°C to below 1200°C, enabling lower temperature sintering while maintaining manufacturing effectiveness.
Solution Approach 2:
The patent creates a composite sintering aid material combining multiple ceramic oxides (MgO, Al2O3, SiO2, CaO, Fe2O3, SO3, TiO2) in specific proportions. This composite material achieves a synergistic effect where the combination of components produces a lower melting point than conventional single-component sintering aids like gehlenite, enabling cost-effective low-temperature sintering.
2Temperature
If conventional ceramic composition (gehlenite) is used as sintering aid, then the ceramic workpiece achieves high density, but the sintering temperature is limited to high level
Solution Approach 1:
The patent systematically adjusts the chemical composition parameters to optimize sintering performance. By controlling the ratios of MgO (1-8 mol%), Al2O3 (5-15 mol%), SiO2 (25-40 mol%), CaO (40-55 mol%), Fe2O3 (0.1-8 mol%), SO3 (0.1-2 mol%), and TiO2 (0.1-2 mol%), the sintering aid achieves reliable effectiveness in reducing sintering temperature to below 1200°C while maintaining consistent sintering quality.
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 ceramic composition allows for sintering at temperatures lower than 1200°C, reducing manufacturing costs and improving the bulk density and properties of ceramic workpieces, while also being suitable for replacing CaCO3 in plastics and stone paper production to enhance heat resistance and stability.
Implementation Method 1
a sintering aid is usually added to form a liquid phase such as a glass phase. Ceramic particles rearrange and viscous flow in the liquid phase
Implementation Method 2
a sintering aid is usually added to form a liquid phase such as a glass phase. Ceramic particles rearrange and viscous flow in the liquid phase
Data Source
AI summary
A ceramic composition which can be used as a sintering aid includes 1-2 mol % of magnesium oxide (MgO), 5-15 mol % of aluminum oxide (Al2O3), 25-40 mol % of silicon dioxide (SiO2), 40-55 mol % of calcium oxide (CaO), 0.1-8 mol % of ferric oxide (Fe2O3), 0.1-2 mol % of sulfur trioxide (SO3) and 0.1-2 mol % of titanium oxide (TiO2). Alternatively, the ceramic composition includes 1-8 mol % of MgO, 5-15 mol % of Al2O3, 25-40 mol % of SiO2, 40-55 mol % of CaO, 0.1-8 mol % of Fe2O3, 0.1-2 mol % of SO3 and 0.9-2 mol % of TiO2.