Organic Slurry Composition for Ceramic Green Sheets
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Solution Overview
Problem
Existing organic solvent-based slurry compositions for ceramic green sheets containing boron and alkaline earth metals tend to gel, leading to increased viscosity and poor degreasability, which affects the quality of multilayer ceramic electronic components.
Innovation Solution
Incorporating an acrylic binder component and a β-diketone, such as acetylacetone, as a chelating agent in the slurry composition, with a content of 0.020 to 0.040 times the weight of boron and alkaline earth metal, to inhibit crosslinking reactions and prevent gelling, while ensuring compatibility with organic solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an organic solvent-based slurry composition containing boron and alkaline earth metals is used, then the slurry can be prepared with ceramic raw powder and binder component, but gelling occurs leading to increased viscosity and poor degreasability
Solution Approach 1:
A chelating agent is introduced as an intermediary substance that binds to boron and alkaline earth metals, preventing them from crosslinking with the binder component. This mediator eliminates the harmful interaction between the ceramic raw powder and binder, resolving the gelling issue while maintaining slurry prepareability
Solution Approach 2:
The chemical parameters of the slurry system are modified by adding specific chelating agents that alter the reactivity of boron and alkaline earth metals. This parameter change prevents the crosslinking reaction that causes gelling, thereby stabilizing the slurry composition without affecting its ease of manufacture
2Ease of manufacture
If a butyral binder component is used with organic solvent and boron-containing ceramic raw powder, then the slurry can be formed, but boron leaches into the organic solvent causing crosslinking reaction and gelling
Solution Approach 1:
The chelating agent serves as a protective intermediary that sequesters boron ions, preventing them from leaching into the organic solvent and reacting with the butyral binder component. This eliminates the crosslinking reaction and maintains slurry consistency throughout the manufacturing process
Solution Approach 2:
The chelating agent is added to the slurry composition in advance to preemptively bind boron and alkaline earth metals before they can cause crosslinking reactions. This preliminary protective action ensures slurry reliability from the formation stage through to green sheet production
3Stability of the object's composition
If water-based slurry composition with chelating agent is used to prevent gelling, then gelling is prevented, but the composition cannot be applied to organic solvent-based slurry due to low solubility of chelating agent
Solution Approach 1:
The solubility parameter is addressed by selecting chelating agents with appropriate chemical structures that are soluble in organic solvents. This parameter adjustment allows the same gelling prevention mechanism to work across different solvent systems, enhancing adaptability while maintaining composition stability
4Stability of the object's composition
If polyalcohol is added to prevent gelling in water-based slurry, then gelling is prevented, but the measure cannot be applied to organic solvent-based slurry due to low solubility of polyalcohol
Solution Approach 1:
The chemical composition parameters are optimized by selecting chelating agents with solubility characteristics matched to organic solvents. This parameter change enables the gelling prevention mechanism to be effectively applied across different solvent systems, including organic solvents where polyalcohols would be incompatible
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 solution effectively prevents gelling and increases degreasability, reducing delamination and firing time, enabling the production of high-quality multilayer ceramic electronic components with improved dimensional and shape accuracy.
Implementation Method 1
a β-diketone, serving as a chelating agent, and the content of the β-diketone is 0.020 to 0.040 times by weight that of boron and an alkaline earth metal
Data Source
Figure 1(1)~1(3)
Figure 2~3(2)
Figure 4
AI summary
Provided is an organic solvent-based slurry composition for ceramic green sheets which includes a ceramic raw powder containing boron and an alkaline earth metal and a binder component, which has a reduced tendency to gelling and increased viscosity, and which has superior degreasability. The slurry composition includes a ceramic raw powder containing boron and an alkaline earth metal, an acrylic binder component, a β-diketone, serving as a chelating agent, and an organic solvent. The content of the β-diketone is 0.020 to 0.040 times by weight the total content of boron and the alkaline earth metal in the ceramic raw powder. The slurry composition is advantageous for use in forming, for example, ceramic layers (3) for a multilayer ceramic substrate (1).