Multi-layer Ceramic Shell for Mobile Terminals
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Solution Overview
Problem
The shielding effect of conductive metal materials on electromagnetic waves in mobile terminals hinders effective communication, particularly with the advent of 5G technology, necessitating a non-metallic solution that maintains strength and fracture toughness while allowing for normal communication.
Innovation Solution
A ceramic shell is developed using alternately overlapped white and color ceramic blank sheets, with specific thickness ranges and processing methods, including tape casting and hot pressing, to create a lightweight, strong, and non-metallic shell that avoids electromagnetic wave interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conductive metal materials are used for mobile terminal shells, then strength and structural integrity are improved, but electromagnetic wave shielding effect increases causing communication problems
Solution Approach 1:
The patent uses composite ceramic materials comprising multiple layers with different properties (white ceramic layers for electromagnetic wave resistance, color ceramic layers for aesthetics) to replace traditional metal materials, achieving both mechanical strength and electromagnetic wave transmission capability
Solution Approach 2:
Different layers of the ceramic shell have different local properties: white ceramic layers provide electromagnetic wave resistance and structural strength, while color ceramic layers provide aesthetic appearance, with each layer optimized for its specific function
2Object-affected harmful factors
If non-metallic materials are used to avoid electromagnetic shielding, then communication is improved, but strength and fracture toughness may be reduced
Solution Approach 1:
The ceramic composite material combines multiple ceramic layers with different compositions and properties, creating a structure that maintains high strength and fracture toughness while resisting electromagnetic waves, overcoming the limitations of single-material non-metallic shells
Solution Approach 2:
The shell is divided into multiple discrete ceramic layers (white ceramic layers and color ceramic layers) that are alternately arranged, allowing each layer to contribute specific properties that collectively provide both strength and electromagnetic wave resistance
3Object-affected harmful factors
If multiple ceramic blank sheets are alternately overlapped to create multi-layer structure, then electromagnetic wave resistance and aesthetics are improved, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process is segmented into distinct steps (tape casting of different layers, alternating arrangement of white and color ceramic blank sheets, hot pressing, sintering), allowing each step to be optimized independently while maintaining overall process control
Solution Approach 2:
The ceramic blank sheets are prepared in advance through tape casting with predetermined compositions and thicknesses, allowing the alternating layer structure to be assembled efficiently during the hot pressing stage without requiring complex real-time processing
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 ceramic shell effectively prevents electromagnetic wave shielding, ensuring normal communication while providing enhanced strength, fracture toughness, and aesthetic appeal, suitable for mobile terminals and other electronic devices.
Implementation Method 1
forming, with a white tape casting slurry, at least one white membrane band by a tape casting forming process, while forming, with a color tape casting slurry, at least one color membrane band by the tape casting forming process
Implementation Method 2
conducting a hot pressing process to obtain a ceramic blank
Implementation Method 3
disposing the ceramic blank together with a shell-forming mold in a vacuum and imposing a first preset temperature and a preset press for a first preset time to obtain a biscuit shell
Implementation Method 4
debinding and sintering the biscuit shell to obtain the ceramic shell
Data Source
AI summary
The disclosure relates to a ceramic shell, a mobile terminal and a method for manufacturing the ceramic shell. The ceramic shell includes a multi-layer ceramic blank sheet including a plurality of alternately overlapped ceramic blank sheets having at least one white ceramic blank sheet overlapped with at least one color ceramic blank sheet, wherein two of the plurality of alternately overlapped ceramic blank sheets on an outermost side of the multi-layer ceramic blank sheet are both white ceramic blank sheets.