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Compared with traditional materials such as metals, advanced engineering ceramics are increasingly favored by more and more industries due to their superior performance and wide applications. Ceramic materials provide higher strength, wear resistance, and thermal stability, making them excellent in many demanding environments.

Applications

• Aerospace: Macor machinable ceramics are an advanced ceramic commonly used in the aerospace industry, such as insulation brackets, hinges for NASA spacecraft, and fixing rings on windows and doors.

• Electronic devices: Due to the excellent insulation performance of advanced ceramics, they are often used to manufacture substrates and insulators in electronic devices, especially in high-frequency and high-power applications, where the electrical characteristics of ceramic materials are more significant.

• Medical devices: Currently, many medical devices use advanced engineering ceramic components and sub assemblies, such as pump parts and high-voltage feedthrough components for X-ray image intensifiers, which can provide higher performance and longer service life for the equipment.

• Semiconductors: Advanced ceramics also have unique performance advantages in the semiconductor field, playing an indispensable role in insulation and thermal conductivity.

  Common examples include aluminum nitride (AlN) and aluminum oxide (Al ₂ O3), which are widely used in equipment such as wafers, packaging materials, substrates, optoelectronic devices, etc

Advantages

• High strength and wear resistance: Advanced ceramics have excellent strength and wear resistance, allowing them to be used for a long time in harsh environments, reducing the frequency of maintenance and replacement.

• Excellent thermal stability: such as aluminum oxide, aluminum nitride, etc., these materials can withstand high temperatures and are suitable for high-temperature applications, ensuring the normal operation of equipment

• Low thermal expansion coefficient: Advanced ceramics typically have a low thermal expansion coefficient, which allows them to maintain stable dimensions under temperature changes, making them suitable for the manufacturing of precision parts.

• Chemical inertness: Most engineering ceramics have good chemical inertness and can resist the erosion of various chemical substances, making them suitable for harsh chemical environments

In the application of advanced engineering ceramics, the design and manufacturing of precision ceramic parts can meet the personalized needs of various applications. For example, in electronic devices, the dimensional accuracy of ceramic substrates directly affects their electrical performance and reliability. High precision machining tolerance requires the use of advanced machining techniques such as CNC milling and grinding in the manufacturing process to ensure that the dimensions and shape of the parts meet the design standards. This not only improves the performance of the product, but also reduces the risk of malfunctions caused by size mismatch.

Jundro Ceramics has rich experience in these fields and can customize components according to personal design and manufacturing, as well as provide ceramic components needed for scientific experiments.

Observational astronomy has sought better telescopes with higher resolution from its beginning. This needs ever-larger mirrors with stable, high-precision surfaces. The extremely low-expansion glass ceramic ZERODUR® has enabled such mirrors for more than 50 years with significant improvements in size and quality since then. We provide a survey of the progress achieved in the last 15 years. Equally important as the thermal expansion coefficient CTE is its homogeneity. The CTE variation in 4-m mirror blanks lies below 5  ppb  /  K in radial and axial directions on large and short scales. Improved measurement capabilities allow reduced bias, which in the past made variations look greater than they were. Isotropy and uniformity of ZERODUR are outstanding. A method for lifetime calculation increases reliability considerably with respect to mechanical loads. The production and metrology capability and capacity are greatly extended. Surface figure and texture of large blanks allow starting directly with polishing. Filigree structures with up to 90% weight reduction are well-suited for space mirrors. The progress with low thermal expansion and its measurement, the insensitivity of ZERODUR against ionizing radiation in space, and outstanding application examples are presented in the first part of our review.

The LISA Pathfinder flight optical bench pictured during construction. The "tombstone" components are precision bonded to the optical bench. The bench is a 20cm by 20cm block of Zerodur ceramic glass. The components that require high precision alignment are bonded individually. The two optical beams arrive into the optical bench through the fibre injector optical subassemblies (FIOS) – seen with the green connectors. This light is then reflected and/or split by the "tombstones". One beam will reflect off the two mirrors to the front and the back of the optical bench that are being used to represent the free-falling test masses. The other beam stays within the bench.

This section introduces calibration settings, materials used, and calibration results using general polynomial methods. In order to calibrate the multi-point measurement system, the light source is moved meandering to M measurement points in the object space. NPMM-200 is used for mobile light sources.

Nanometer measurement positioning machine NPMM-200

The NPMM-200 consists of a three-axis positioning system with precision guides and actuators. It is designed based on the so-called sample scanning mode, in which the object to be measured, rather than the measuring sensor, moves. The position of the movable measurement object carrier is determined by three interferometers. The arrangement of the interferometer ensures that the virtual intersection point of its beam is fixed spatially at the contact point of the measuring sensor. The movable measurement object carrier has three high-precision measurement reflective surfaces [? 20], on which the interferometer beam is reflected. Figure 6 shows the measurement object carrier and measurement framework of NPMM-200.