Ceramic Plates

Hunan Guoci New Material Technology Co., Ltd.

Alumina Ceramic Parts,Ceramic Plates

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95% and 99% Alumina Ceramic Plates for Optical Sensors

95% and 99% Alumina Ceramic Plates for Optical Sensors

Material: Aluminum Oxide, Alumina, 95%-99.9% Al₂O₃

Sizes：Min-OD: 0.02mm; Max-length: 500mm

Customized: Can be custom for special sizes and shapes

Delivery Times：2 -25 days(depends on the structure and quantity)

Features：High hardness, High temperature resistance, Wear resistance, Corrosion resistance, High insulation

  1. Fracture Toughness (MPa·m¹/²): 3.8-4.4
  2. Refractoriness: 1500-1750℃
  3. Density: 3.7-3.95g/cm3
  4. Flexural Strength (MPa): 300-375
  5. Thermal Conductivity: 25-30W/M.K
Transport Package: Cartons, Wooden Box

Shipment: by sea by air by courier by post etc.

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Product Description

Alumina ceramics (especially high-purity Al₂O₃, such as 95% and 99% alumina) have become an indispensable key material in high-end optical sensors due to their unique range of physical, chemical, and electrical properties. It is typically not used as the photosensitive element itself, but rather as the sensor substrate/base, encapsulation housing, or internal structural component.

Alumina ceramic plates play the role of "skeleton" and "skin" in optical sensors—providing robust support, a stable environment, efficient heat dissipation, and reliable protection for the internal precision optical "organs."

Their balanced overall performance (thermal, electrical, mechanical, and chemical) makes them one of the preferred materials for mid-to-high-end, high-reliability optical sensors, especially in demanding applications such as automotive, industrial, communications, and military.

Roles and Functions

Alumina ceramics possess excellent thermal properties, superior electrical properties, outstanding mechanical properties, good chemical stability, and compatibility with precision manufacturing processes.

The following are specific roles, advantages, and examples of alumina ceramic plates in optical sensors:

1. Sensor Packaging Substrate and Housing
  • Function: This is the most important application. Alumina ceramics are fabricated into flat plates or cavity-encapsulated packages for housing and securing photosensitive chips (such as CCDs, CMOS sensors, and photodiodes), LED light sources, optical filters, microlenses, and other components.
  • Advantages: Provides a stable, sealed, and clean "house" for internal precision optical components.

2. Heat Dissipation Substrates
  • Function: High-power optical sensors (such as receivers for high-power lidar and high-brightness LEDs) generate significant heat during operation. Alumina ceramics have excellent thermal conductivity, rapidly dissipating heat from the chip and preventing sensor performance degradation or damage due to overheating.
  • Advantages: Excellent thermal conductivity combined with outstanding electrical insulation makes it an ideal thermal management material.

3. Optical Windows or Lens Mounts
  • Function: In some sensor designs, alumina ceramics are used as precision structural components supporting optical windows or lenses. Due to its low coefficient of thermal expansion, it ensures stable lens position and focus despite temperature changes.
  • Advantages: High rigidity and low thermal expansion ensure long-term stability of the optical system.

Application

Specific Application Examples

1. LiDAR.
  • In automotive or industrial LiDAR systems, the optical sensors at the receiver (typically APD or SPAD arrays) require extremely high sensitivity and stability. Alumina ceramic substrates support these chips and provide excellent heat dissipation and electrical insulation, ensuring reliable operation under rapid temperature changes and strong electromagnetic interference.


2. Fiber Optic Communication Sensors.

  • Used for packaging optical transceiver modules. High-speed photodiodes and lasers have extremely high requirements for thermal management and signal integrity, making alumina ceramics an ideal choice.

3. Industrial Process Control Sensors.
  • For example, optical sensors used to detect color, transparency, or presence often operate in dusty, humid, and chemically corrosive factory environments. Alumina ceramic housings provide robust protection and hermetic encapsulation.

4. High-End Imaging Systems.
  • In some scientific or industrial-grade CCD/CMOS cameras, sensor chips are mounted on alumina substrates to achieve optimal thermal stability and electrical performance.

5. Gas Sensors.
  • While many gas sensors use other ceramics (such as zirconia), alumina ceramics are also used as reflective cavities or support structures in some optically based gas sensors (such as non-dispersive infrared NDIR) due to their smooth surface, chemical inertness, and ease of fabrication.

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