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Cearceram-Z Glass

POC-OC-122488-Ohara Cearceram-Z Glass

  • Near-zero thermal expansion ensures exceptional dimensional stability for high-precision applications.
  • High thermal resistance and mechanical durability suitable for extreme environments.
  • Outstanding optical clarity and homogeneity across a broad range of applications.
  • Processed and customized by POC for various optical, industrial, and metrological uses.
  • Excellent performance in precision instruments, optics, and demanding scientific applications.

Customizable Components Available for This Material to Meet Your Specific Needs!

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General Description

Ohara Cearceram-Z Glass is a premium glass-ceramic material renowned for its exceptional thermal and mechanical properties. While this material is manufactured by Ohara, Photonics On Crystals (POC) specializes in processing Cearceram Glass into custom components tailored for a wide range of industries.

This glass-ceramic material is distinguished by its near-zero coefficient of thermal expansion, ensuring unparalleled dimensional stability even under significant temperature variations. Cearceram-Z is highly resistant to thermal and mechanical stresses, making it ideal for applications requiring long-term precision and durability. It is widely used in optical systems, high-performance metrology instruments, and other advanced scientific and industrial applications.

The material’s exceptional homogeneity and stability make it indispensable for high-performance optics, from astronomical telescopes to cutting-edge photonics devices. Its versatility is complemented by POC’s expertise in shaping, coating, and customizing Cearceram-Z Glass for specialized requirements.

General Applications and Examples

  1. Astronomy and Optics:
    Ohara Cearceram Glass is widely used in telescope mirrors and optical substrates for astronomical applications. Its thermal stability ensures precise optical performance even under fluctuating temperatures.
  2. Semiconductor and Lithography:
    Cearceram-Z Glass serves as a critical substrate material in lithography tools and semiconductor manufacturing, where thermal expansion must be minimized to achieve nanometer-level precision.
  3. Metrology and Measurement:
    Due to its dimensional stability, Cearceram-Z Glass is ideal for high-precision measurement tools, including interferometers, coordinate measuring machines, and optical comparators.

Chemical and Structural Properties

PropertyValue
Material TypeGlass-ceramic
Density~2.5 g/cm³
Thermal Expansion Coefficient~0.02 × 10^-6/K
Young’s Modulus90 GPa
Poisson’s Ratio0.24
Hardness (Knoop)~650
Refractive Index (at 550 nm)~1.54
Transparency Range0.3–2.5 µm
Chemical DurabilityResistant to acids and alkalis

Optical Properties

PropertyValue
Thermal StabilityUltra-stable for precision optics
Surface Quality10-5 (scratch-dig)
Surface Flatnessλ/10 @ 632.8 nm
Optical HomogeneityExcellent across large dimensions
Absorption CoefficientLow, minimizing energy loss

Standard Fabrication Specifications

SpecificationValue
Dimensional Tolerance±0.02 mm
Surface Flatnessλ/10 @ 632.8 nm
Parallelism<5 arcseconds
Scratch-Dig Quality10-5
Maximum SizeUp to 800 mm (customizable)
Beveling<0.2 × 45°

Spectrum Transmission Curve

Transmission characteristics of Cearceram-Z Glass exhibit high transparency within the 0.3–2.5 µm range. This allows for superior performance in visible and near-infrared applications. Spectrum transmission data can be provided upon request.

Coating Specification

  • Anti-Reflective Coatings: Customizable coatings to enhance transmission for specific wavelength ranges.
  • Metallic Coatings: For high reflectivity, especially in laser systems.
  • Protective Coatings: Durable coatings for enhanced longevity in demanding environments.
  • Adhesion Test: Compliant with MIL-C-675C military standards, an adhesion test involved applying a tape that meets LT-90 specifications onto the lens film layer. The tape was affixed fully and then removed vertically. This procedure was performed three times, resulting in no blistering or peeling.
  • Temperature Test: In line with MIL-C-675C specifications, test pieces were subjected to temperatures of -62±1℃ and 71±1℃. After maintaining them at room temperature (16℃~32℃) for two hours, the adhesion test was repeated, confirming no film detachment.
  • Abrasion Resistance Test: Conforming to MIL-C-675C and CCC-C-440 standards, the abrasion resistance test involved a gauze tester applying a minimum force of 1.0 lbs (0.45 kg) to the film. This was repeated 25 times with gauze widths of 1/4 inch (6.4mm) and 3/8 inch (9.5mm), ensuring no damage occurred to the film surface.
  • Humidity Test: Under MIL-C-675C criteria, the test piece was placed in a controlled temperature and humidity chamber set to 49 ±2℃ and 95%~100% humidity for 24 hours. The film remained intact, with no peeling, scratches, or other defects.
  • Solvent and Cleaning Testing: Following MIL-C-675C specifications, test pieces were exposed to room temperature conditions (16℃~32℃) and tested with acetone and alcohol for at least 10 minutes each. After air drying and subsequent cleaning with a cotton cloth soaked in alcohol, the film surface showed no signs of peeling or scratches.
  • Salt Spray Test: After 100 hours in a 35°C environment with a 5% saltwater concentration, the film showed no signs of damage.
ProductDimensions (mm)Surface FlatnessPrice (USD)
Cearceram-Z Optical Substrate100 × 100 × 20λ/10$2,500–$4,500
Cearceram-Z Prism50 × 50 × 10λ/8$1,500–$3,000
Cearceram-Z Optical Window200 × 200 × 30λ/6$3,500–$6,500
Customization OptionsAvailable upon requestTailored SpecificationsContact for quote

POC-OC-122488-Ohara Cearceram-Z Glass

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