Braze-Free Substrate Heater Assembly for High-Vacuum 1000°C Operation
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Solution Overview
Problem
Brazing process limitations in substrate heating devices result in restricted operating temperatures, mechanical instability, and contamination issues due to vaporization of braze alloys, particularly in high-temperature and low-pressure environments, which affect the longevity and purity of materials being processed.
Innovation Solution
A braze-free substrate heating device design that compresses a resistive heating element between a heater block body and lid, maintaining continuous physical and thermal contact without a braze alloy, allowing for higher operating temperatures and reduced contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a brazing process is used to bond the resistive heating element to the conductive plate, then the heating device can be manufactured with good initial contact, but the maximum operating temperature is limited due to vaporization of the braze alloy
Solution Approach 1:
The invention removes the braze alloy layer from the heating device structure, eliminating the component that vaporizes at high temperatures. The heating element is placed in direct contact with the conductive plate without any intermediate bonding material, thus extracting the problematic element that limits maximum operating temperature.
Solution Approach 2:
The heating element is pre-compressed between the conductive plate and a compression element before operation. This preliminary compression ensures continuous physical and thermal contact is maintained during high-temperature operation, preventing mechanical instability without requiring braze alloy that would vaporize.
2Ease of manufacture
If a brazing process is used to manufacture the heating device, then the heating element can be bonded to the conductive plate, but contaminants from the vaporized braze alloy are introduced into the processing chamber
Solution Approach 1:
The invention eliminates the braze alloy from the manufacturing process, removing the source of contamination. By using direct contact between the heating element and conductive plate without intermediate materials, the process prevents vaporization of braze alloy and subsequent contamination of the processing chamber.
Solution Approach 2:
The invention converts the potential harm of requiring a bonding process into a benefit by demonstrating that direct compression contact without braze alloy achieves both manufacturing feasibility and contamination-free operation. The compression mechanism itself becomes the beneficial bonding method.
3Ease of manufacture
If a brazing process is used, then the heating device can be assembled, but the braze alloy vaporization causes local hot spots that reduce device lifetime
Solution Approach 1:
The invention removes the braze alloy layer that causes localized heating and hot spots. By establishing direct thermal contact between the heating element and conductive plate through compression, the intermediate material that creates thermal resistance and hot spots is eliminated, extending device lifetime.
Solution Approach 2:
The heating element is pre-compressed between the conductive plate and compression element before operation to ensure uniform thermal contact. This preliminary compression action prevents the formation of hot spots during high-temperature operation, maintaining device integrity and extending lifetime.
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 braze-free design achieves reliable operation up to 1,000°C with improved mechanical stability and reduced contamination, enhancing the longevity and purity of processed materials while reducing manufacturing costs.
Implementation Method 1
a heating element between the heater block lid and the heater block body; the heating element being compressed between the heater block body and the heater block lid
Implementation Method 2
the heating element being in continuous physical and thermal contact with the heater block lid and the heater block body
Data Source
AI summary
A braze-free substrate heating device including a heater block body, a heater block lid, and a heating element. The heating element sits inside the heater block body. The heater block lid is on the heating element, such that the heating element is sandwiched between the heater block lid and the floor of the heater block body. The heating element is held in place by compressing the heater block lid into the heater block body and attaching the heater block lid to the top of the heater block body so that the heating element is fully supported over its surface area, and can maintain uniform thermal contact with the heater block lid and heater block body over its entire surface area.