Silicon Carbide Container Brazing with Localized Cold-Zone Protection
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Solution Overview
Problem
Existing methods for closing silicon carbide-based containers require high-temperature integral heating, which is not suitable for containers housing objects that deteriorate at high temperatures.
Innovation Solution
A method involving the use of a silicon carbide-based plug and a brazing material, where the orifice of the container is closed by brazing the plug onto the container, with localized heating to melt the brazing material and form a solid joint, while keeping the cold part of the cavity at a temperature lower than the degradation temperature of the object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If customary methods are used to join two silicon carbide-based parts securely, then the joint strength and reliability are improved, but the heating temperature must be raised to high levels that cause thermal degradation of enclosed objects
Solution Approach 1:
The patent applies localized heating to the orifice region only, rather than heating the entire container uniformly. This allows the brazing process to occur at high temperature locally at the joint, while the enclosed object in the cavity remains at a lower, non-degradative temperature. The localized thermal field creates different temperature zones within the same system, resolving the contradiction between achieving strong joints and protecting sensitive objects.
Solution Approach 2:
The heating process is segmented into two distinct zones: a high-temperature zone at the orifice for brazing, and a low-temperature zone in the cavity for protecting the enclosed object. This spatial segmentation of thermal conditions allows simultaneous achievement of strong joint formation and object protection, eliminating the need for integral heating of the entire structure.
2Ease of manufacture
If integral heating to high temperatures is applied for brazing, then the brazing joint is formed successfully, but the enclosed object deteriorates due to exposure to high temperatures
Solution Approach 1:
The heating is concentrated locally at the orifice region where brazing occurs, creating a localized high-temperature zone. The enclosed object in the cavity is shielded from this intense heating, maintaining a temperature below its degradation threshold. This local quality approach allows successful brazing without exposing the object to harmful thermal conditions.
3Reliability
If a robust and oxidation-resistant closure is achieved through high-temperature brazing, then the joint reliability is improved, but the complexity of the heating process increases
Solution Approach 1:
The heating system is designed to provide localized thermal energy only at the orifice region, rather than heating the entire container. This can be achieved through focused heating methods such as induction heating coils positioned at the orifice, laser heating, or flame heating directed at the joint area. The localized approach simplifies the overall heating system while achieving the same brazing results, as less total energy is required and thermal control is more straightforward.
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 method is simple, rapid, and does not degrade the mechanical and thermal properties of the container, ensuring the physical integrity of the object and achieving a robust, fluid-tight, and oxidation-resistant closure capable of withstanding high temperatures up to 1200°C or 1300°C.
Implementation Method 1
the brazing comprising the melting of the brazing material by heating to a temperature greater than the melting temperature of the brazing material
Implementation Method 2
followed by solidification of the brazing material so as to form a solid joint between the container and the plug
Implementation Method 3
localized supply of heat, the cold part of the cavity remains at a temperature that ensures the physical integrity
Data Source
AI summary
A method for closing an orifice of a container. The method involves first providing a silicon carbide-based container comprising a cavity that is open by an orifice, of a silicon carbide-based plug and of a brazing material borne by the plug and/or the container. A solid object is housed in the cavity. Then the orifice is closed by brazing the plug onto the container. The brazing involves the melting the brazing material followed by solidification of the brazing material so as to form a solid joint between the container and the plug. At least a part of the cavity, referred to as a cold part, in which the solid object is housed, is kept at a temperature lower than the degradation temperature of the solid object during the brazing.