Sintering Chamber Flow Gap for Oxygen-Free Dental Ceramics
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Solution Overview
Problem
Sintering furnaces in dental technology face challenges in achieving complete oxygen-free sintering due to residual oxygen diffusion, despite existing complex devices being cost-prohibitive for practical use.
Innovation Solution
A device with a sintering chamber formed by a base plate and hood, utilizing a flow channel and/or flow gap between protective gas supply and discharge to accelerate inert gas, creating a Venturi effect that displaces and removes oxygen through the sintering chamber, reducing the required protective gas volume and preventing oxygen penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex sintering furnaces are used to achieve complete oxygen-free sintering, then oxygen-free sintering is achieved, but the device complexity and cost increase significantly
Solution Approach 1:
The invention extracts the critical oxygen prevention function from the complex furnace system and implements it through a simple flow gap structure between the base plate and hood. This flow gap creates a protective gas flow that actively prevents oxygen diffusion at the critical interface, achieving oxygen-free sintering without requiring complex vacuum systems or multiple sealing mechanisms.
Solution Approach 2:
The invention applies local quality by concentrating the protective gas flow precisely where oxygen diffusion is most problematic - at the interface between the base plate and hood. The flow gap is strategically positioned to create a localized protective gas barrier that addresses the specific oxygen leakage issue without requiring complex system-wide modifications.
2Object-affected harmful factors
If protective gas is used to prevent oxidation, then oxidation is prevented, but residual oxygen diffusion still occurs through leaks and gaps
Solution Approach 1:
The invention uses pneumatic principles by creating a pressurized protective gas flow through the flow gap. The protective gas is introduced at a pressure that creates a directed flow through the gap, actively pushing back against oxygen diffusion. This pneumatic approach transforms the passive protective gas atmosphere into an active oxygen-barrier system.
Solution Approach 2:
The invention introduces dynamics by creating a flowing protective gas atmosphere rather than a static one. The continuous flow of protective gas through the flow gap dynamically replaces any oxygen that attempts to diffuse in, maintaining a consistently oxygen-free environment throughout the sintering process.
3Reliability
If more protective gas is used to displace oxygen, then oxygen displacement improves, but the required protective gas volume increases
Solution Approach 1:
The pneumatic design of the flow gap system allows protective gas to be delivered efficiently with high velocity and directional control. The gap geometry optimizes gas flow characteristics, creating a focused jet that effectively displaces oxygen without requiring excessive gas volumes. This pneumatic approach uses gas dynamics rather than sheer quantity to achieve oxygen displacement.
Solution Approach 2:
The invention changes the parameters of protective gas delivery by controlling flow rate, pressure, and velocity through the flow gap. By optimizing these parameters, the system achieves maximum oxygen displacement efficiency with minimum protective gas consumption. The flow gap dimensions and gas introduction parameters are tuned to create the most effective oxygen barrier per unit of protective gas.
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 device achieves oxygen-free sintering with reduced protective gas usage, effectively preventing oxidation and discoloration of sintered objects by accelerating inert gas to enhance flow rate and suction, thus ensuring high-quality sintered products.
Implementation Method 1
A flow channel and/or a flow gap are arranged between the protective gas supply and the protective gas discharge... The flow channel can widen into a flat flow gap or a flow gap that is more extensive in width... This configuration achieves an acceleration of the protective gas in the flow gap, circulation gap or flow channel in relation to the supply and discharge.
Data Source
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AI summary
The invention relates to a device for the oxygen-free sintering of metal or ceramics, particularly in the field of dental technology, in which a sintering chamber that can be supplied with protective gas is formed from a base plate and a hood. This protective gas can be introduced by means of a protective gas inlet and conducted away via a protective gas outlet, with a flow channel and/or a flow gap being located between said protective gas inlet and protective gas outlet.