Silica Parting Agent Coating for Glass-Ceramic Warping Prevention
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Solution Overview
Problem
Conventional ceramming processes for glass-ceramic manufacturing often result in warping due to adhesion between glass sheets and setter plates, leading to reduced quality and throughput of high-strength glass-ceramic articles.
Innovation Solution
A parting agent material comprising an aqueous dispersion of amorphous silicon dioxide agglomerate particles and a dispersant, applied as a coating to prevent adhesion and stiction between glass articles and setter plates, ensuring non-reactivity and thermal stability during high-temperature ceramming cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional ceramming processes are used without parting agents, then the manufacturing process is simple, but adhesion between glass sheets and setter plates causes warping and reduces article quality
Solution Approach 1:
A parting agent layer comprising colloidal silicon dioxide and amorphous silicon dioxide agglomerate particles is applied between the glass article and setter plate. This intermediary layer prevents direct adhesion during ceramming, eliminating warping caused by stiction while maintaining process simplicity through a single coating step.
2Manufacturing precision
If parting agents are applied to prevent adhesion, then warping is reduced, but the parting agent must remain thermally stable without decomposing or reacting during high-temperature ceramming cycles
Solution Approach 1:
The parting agent combines colloidal silicon dioxide (providing adhesion to glass) with amorphous silicon dioxide agglomerate particles (providing thermal stability and non-stick properties). This composite structure maintains composition stability during high-temperature ceramming cycles up to 1200°C while preventing warping.
Solution Approach 2:
The parting agent is designed with specific particle size parameters (agglomerates ranging from 100 nm to 20 microns) and composition ratios (10-30 wt% amorphous silicon dioxide) that optimize both thermal stability and anti-adhesion performance during ceramming cycles.
3Manufacturing precision
If parting agents are used to prevent stiction, then article quality improves, but additional processing steps and material application are required
Solution Approach 1:
The parting agent layer simultaneously provides multiple functions: (1) prevents adhesion between glass and setter plate, (2) prevents stiction between stacked articles, (3) maintains article flatness during ceramming, and (4) leaves minimal residue requiring no additional cleaning steps. This multi-functionality improves article quality while maintaining manufacturing simplicity.
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 parting agent material effectively reduces warping, improves the quality and throughput of glass-ceramic articles by preventing adhesion and stiction, while being environmentally friendly and non-reactive, thus avoiding additional processing steps and waste generation.
Implementation Method 1
the dispersant can adhere the amorphous silicon dioxide agglomerate particles to the first surface of the glass article
Implementation Method 2
The parting agent materials and parting layers physically and chemically separate adjacent glass articles in a glass stack during a ceramming process
Implementation Method 3
the parting agent materials and parting layers can be non-reactive with the glass composition of the glass articles such that, during a ceramming cycle, the parting agent materials and layers do not cause an undesirable phase change at surfaces of the glass articles
Data Source
AI summary
Coated glass articles for a glass-ceramic ceramming process including a parting agent coated on a surface of the glass article. The parting agent coating can comprise an aqueous dispersion comprising amorphous silicon dioxide agglomerate particles and a dispersant. The parting agent coating can be dried to forming a parting layer for glass articles in a glass stack for a ceramming process that transforms the glass articles into glass-ceramic articles.