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Technical Ceramics in Pressure Sensors: Why, When, and Where Are They Used?
Peter Fox, Business Development ManagerPresented at Sensor+Test Trade FairNuremburg, GermanyJune 26, 2019
2 CoorsTek Confidential
Agenda
• Brief CoorsTek overview• Pressure sensors explained• Why, when, and where are Technical Ceramics used• Choose the right Technical Ceramics partner
Brief CoorsTek Overview
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Heritage of Innovation
1870s 1900s 1920s 2000s1940s 1960s 1980s
CERAMIC-TO-METAL BONDING
DRY PRESS FORMING
RECYCLABLE ALUMINUM CAN
ISOSTATIC PRESSED GRINDING MEDIA
COORS CERAMICS BECOMES COORSTEK
GLOBAL EXPANSION
PURESIC® CVD SILICON CARBIDE
DURA-Z™ ZIRCONIA
PLASMAPURE-UC™ ALUMINA
COORS BREWERY IN GOLDEN/COLORADO
CENTER FOR ADVANCED MATERIALS
ADVANCED TECHNICAL CERAMICS
WORLD LEADER IN LABWARE
GOLDEN POTTERY THIN-FILM SUBSTRATES
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Technical Ceramics Leader
Ct½+
CoorsTek6000
61/118 Utilizing over ½ of Earth’s known elements
GLOBAL CAPACITY500,000 m2 ceramic manufacturing space
EXPERTISE6,000 employees worldwide
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Materials Expertise
Over ½ of Earth’s known elements
>300 advanced ceramic material
formulations
custom options,
one optimized solution
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ALUMINAS
300+ Technical Ceramic Compounds
ZIRCONIAS
CARBIDES
OXIDES NON-OXIDES
CUSTOM
COMPOSITES
SPECIALTY
NITRIDESRARE EARTHS
CoorsTek Proprietary
SILICATES
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Worldwide Facilities
30 manufacturing sitesTechnology & manufacturing customers in 70 countries
Connect & collaborate worldwide
9
DEFENSE & AEROSPACE SEMICONDUCTORAUTOMOTIVE
Diverse Offerings in Key Global Markets
CHEMICALS & ENERGY
10
Diverse Offerings in Key Global Markets
CHEMICALS CONSUMER & HOUSEHOLD ELECTRONICS
EQUIPMENT & MANUFACTURING
AGRICULTURE & NUTRITION MEDICAL
Pressure Sensors Explained
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Basic Physics of Pressure Sensing
𝑃 =𝐹𝐴𝑜𝑟
∆𝐹∆𝐴
Where:P = PressureF = ForceA = Area∆ = Change in
• Absolute Pressure: Measured relative to a perfect vacuum
• Differential pressure: Difference in pressure between two points of Measurement
• Gauge Pressure: Measured relative to ambient pressure
In practice, many noise factors exist
• Gas Effects: Gases are highly compressible
• Temperature Effects: Temperature can influence density and other mechanical properties
• Dynamic Effects: Most practical applications involve dynamic pressures
1 atm
0 atm
Absolute
GaugeDifferential
Source: Bicking, Robert E. “Fundamentals of Pressure Sensor Technology.” Sensors Magazine, 1 Nov. 1998, www.sensorsmag.com/components/fundamentals-pressure-sensor-technology.
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Pressure Sensing Technologies Pressure Sensing
Technologies
Non-Force Measurement
Ionization
Resonant
Thermal
Force Measurement
Capacitive
Electromagnetic
Force Balancing
Optical
Piezoelectric
Potentiometric
Strain Gauge
Sensing Element
Transducer Element
Signal Condition
Physical Movement
Electrical Output
P V
Source: Bicking, Robert E. “Fundamentals of Pressure Sensor Technology.” Sensors Magazine, 1 Nov. 1998, www.sensorsmag.com/components/fundamentals-pressure-sensor-technology.
Functional Block Diagram of Basic Pressure Sensor
Pressure sensor types that commonly use technical ceramics shown in dark red
Pressure sensor types which use either single crystal or synthetic piezoelectric materials as sensing element
Why, When, and Where Are Technical Ceramics Used
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Why Technical Ceramics?
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• Hardness
• Rigidity
• Toughness
• Wear
MECHANICAL
• Shock & Stability
• Conductivity
• Expansion
• Creep
THERMAL
• Resistivity
• Conductivity
• ESD-safe
• Dielectric Strength
ELECTRICAL
• Corrosion
• Biocompatible
• Ultra-pure
• Inert (or active)
CHEMICAL
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• Durability – Ceramics are inherently resistant to chemical corrosion and mechanical abrasion
• Reliability – Ceramic diaphragms operate at their calibrated values longer than other conventional materials
• Precision – Ceramics can be manufactured into complex and precise form factors for optimal packaging
• Temperature – Ceramics maintain superior thermal stability during extreme temperature exposure
Why Use Technical Ceramics for Pressure Sensors?
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Range Classification
<10 bar Low
10-100 bar Medium
100-250 bar High
>250 bar Extreme
When and Where Are Technical Ceramics Used?Pressure Sensors
Ceramic sensors commonly used in medium range applications
Ceramic pressure sensors are ideally suited for high duty cycle applications and can handle a wide range of working media. This combination of requirements commonly exist in the following industries:
• Agricultural & Off-Road Vehicles• Automotive & Transportation• Energy & Chemical• Equipment & Machinery• Food & Beverage• Heating, Ventilation, and Air Conditioning
(HVAC)• Medical• Military
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Pressure Sensing Technologies using Technical Ceramics:
Strain Gauge Capacitive
Pressure
Pressure
Ceramic component with integrated membrane
Strain gauge element to measure membrane deflection
Ceramic component
Ceramic diaphragm
Defined gap to measure deflection due to change in electrical capacitance
Choose The Right Technical Ceramics Partner
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Choose The Right Technical Ceramics Partner
Ease ofDoing Business
Global presence
Design Expertise
Material and manufacturing
Material Portfolio
Customizedmaterial options
QualitySystems
State of the Art
AdvancedSecondary Processing
Single source service
Manufacturing Capabilities
Vertically integrated
