Composite Plate Shock Resistance via Base Material Deformation
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Solution Overview
Problem
Current materials, such as tempered glass and zirconia sintered bodies, face challenges in achieving both high shock resistance and light weight for mobile electronic device components, as increasing thickness for shock resistance increases weight and reducing thickness compromises impact resistance.
Innovation Solution
A composite plate structure is developed, comprising a zirconia sintered body bonded with a base material like tempered glass, Bakelite, or aluminum, where the base material has a lower elastic modulus than the zirconia, allowing for deformation and absorption of impact, thereby reducing tensile stress and enhancing shock resistance without increasing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of zirconia sintered body is increased to improve shock resistance, then shock resistance is improved, but weight increases
Solution Approach 1:
The patent applies composite materials by bonding a zirconia sintered body (providing hardness and abrasion resistance) with a base material having lower elastic modulus (providing shock absorption). This composite structure achieves high shock resistance without requiring increased thickness, thereby maintaining lightweight design. The composite plate exhibits both the advantages of zirconia (hardness) and the base material (shock absorption), resolving the contradiction between shock resistance and weight.
2Weight of moving object
If the thickness of zirconia sintered body is reduced to reduce weight, then weight is reduced, but shock resistance becomes insufficient
Solution Approach 1:
The composite structure allows the zirconia sintered body to be used at reduced thickness (maintaining lightweight design) while the bonded base material compensates for shock absorption. The lower elastic modulus of the base material allows it to deform and absorb impact energy, protecting the thinner zirconia layer from cracking. This resolves the contradiction by distributing the shock resistance function across both materials.
Solution Approach 2:
The patent changes the elastic modulus parameter by selecting a base material with lower elastic modulus than the zirconia sintered body. This parameter difference enables the base material to deform more easily under impact, absorbing shock energy and reducing tensile stress on the zirconia. This parameter change allows thin zirconia design while maintaining shock resistance.
3Ease of manufacture
If tempered glass is used for exterior components, then ease of manufacture is improved, but abrasion resistance is insufficient
Solution Approach 1:
The patent creates a composite structure where the zirconia sintered body (with superior abrasion resistance and hardness) is bonded to a base material. The zirconia layer serves as a protective surface that resists scratching and wear, while the base material provides structural support and shock absorption. This composite approach maintains the ease of manufacturing benefits while dramatically improving abrasion resistance.
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 composite plate achieves high shock resistance and abrasion resistance while maintaining a lightweight design, suitable for use in mobile electronic devices, with a thickness of 2 mm or less and an apparent density of 4.3 g/cm3 or less, effectively preventing cracking from impacts.
Implementation Method 1
the base material has a lower elastic modulus than the zirconia, allowing for deformation and absorption of impact, thereby reducing tensile stress
Implementation Method 2
A composite plate structure is developed, comprising a zirconia sintered body bonded with a base material
Data Source
AI summary
A composite plate having a thickness of no more than 2 mm, and having laminated therein a zirconia sintered body, an adhesive layer, and a base material, the elasticity of the base material being no more than 100 GPa, and the apparent density of the composite plate being no more than 4.3 g/cm3.