2D Zigzag Heating Wire for Uniform Ceramic Heater Density
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Solution Overview
Problem
Ceramic heaters face challenges in maintaining uniform heat density and rapid temperature ramp-up due to the limitations of 3D coil heating wires, which experience deformation during sintering and have inefficient heat distribution, while 2D flat-surface wires suffer from reduced heat density and slow temperature ramp-up.
Innovation Solution
A two-dimensionally arranged heating wire with a zigzag form, featuring varying pitches and amplitudes, is designed to be parallel to the ceramic substrate's surface, allowing for uniform heat distribution and rapid temperature increase, with both ends connecting to a hollow shaft and having a thermal expansion coefficient matching the ceramic substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a 3D coil heating wire is used, then heat generation capability is improved, but uniform heat density cannot be maintained due to shape deformation during sintering
Solution Approach 1:
The heating wire is transformed from a three-dimensional coil structure to a two-dimensional flat pattern that conforms to the ceramic substrate surface. This dimensional reduction eliminates the thickness issue (W>D problem) and prevents shape deformation during sintering, while maintaining heat generation capability through optimized trace routing and width distribution
Solution Approach 2:
The heating wire trace width is varied locally across different regions of the ceramic substrate. By adjusting the trace width in specific areas, uniform heat density is achieved despite the two-dimensional constraint, compensating for heat loss at edges and ensuring consistent temperature distribution across the substrate surface
2Manufacturing precision
If a 2D flat-surface heating wire is used, then uniform heat density is improved, but temperature ramp-up speed decreases due to limited thickness
Solution Approach 1:
The physical parameters of the heating wire are optimized by using metal paste with controlled thickness (5-20 micrometers) and adjusting the trace width (0.1-1.0 millimeter). These parameter changes enable the 2D heating wire to achieve both uniform heat density and sufficient heating speed by balancing the surface area for heat distribution with the cross-sectional area for heat generation
3Power
If a 3D coil heating wire is used, then heat generation is improved, but arrangement difficulty increases due to complex shape
Solution Approach 1:
The heating wire is laid out as a two-dimensional flat pattern directly on the ceramic substrate surface, eliminating the need for complex three-dimensional coiling and arrangement. This simplifies the manufacturing process significantly, as the heating wire can be directly printed or deposited in its final configuration without requiring manual coiling or complex positioning
Solution Approach 2:
The heating wire pattern is pre-designed and pre-positioned on the ceramic substrate before sintering. By establishing the exact trace routing, width variations, and connection points in advance, the manufacturing process is simplified and ensures accurate heat distribution from the beginning
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
This arrangement ensures efficient heat delivery to the semiconductor wafer, maintaining uniform heat density and enabling rapid temperature ramp-up while minimizing cold spots and accommodating sintered ceramic substrates, with adjustable density and ease of arrangement.
Implementation Method 1
a heating wire 4 that is a metal wire of a three-dimensional (3D) coil type and arranged inside the ceramic substrate 2 to emit heat
Implementation Method 2
a ceramic substrate 2 that is a circular flat-panel member manufactured by using a ceramic material such as aluminum nitride (AlN) or aluminum oxide (Al2O3)
Data Source
AI summary
Provided is a heating wire arrangement for a ceramic heater, which is an arrangement of a heating wire on a ceramic substrate in a ceramic heater and emits heat. The heating wire arrangement for the ceramic heater includes a heating wire that is a metal wire member extending in a longitudinal direction and is two-dimensionally arranged on a virtual two-dimensional (2D) plane that is substantially parallel to a top surface of the ceramic substrate.Thus, a uniform heat density may be maintained and a rapid temperature ramp-up may be enabled, unlike a conventional heating wire of a three-dimensional (3D) type.