Fine Ceramics, Advanced Ceramics, Alumina Ceramics, Al₂O₃
The precision ceramic parts produced by TOUCH-DOWN Technology can be made of high-purity ceramic raw materials, 92~97% alumina, 99.5% alumina, 99.9% alumina, and CIP cold isostatic pressing. High temperature sintering and precision machining, dimensional accuracy of ± 0.001mm, smoothness up to Ra0.1, use temperature up to 1600 degrees. Different colors of ceramics can be made according to customers' requirements, such as: black, white, beige, dark red, etc. The precision ceramic parts produced by our company are resistant to high temperature, corrosion, wear and insulation, and can be used for a long time in high temperature, vacuum and corrosive gas environment.Widely used in a variety of semiconductor production equipment: Frames (ceramic bracket), Dome (cover), Substrate (base), Arm (manipulator), Tray, Roller , Small Part , Bolt (Threaded teeth), Screws and other products above.Application of high purity alumina ceramics: 1. Applied to semiconductor equipment: ceramic vacuum chuck, cutting disc, cleaning disc, ceramic CHUCK 2. Wafer transfer parts: wafer handling chucks, wafer cutting discs, wafer cleaning discs, wafer optical inspection suction cups 3. LED / LCD flat panel display industry: ceramic nozzle, ceramic grinding disc, LIFT PIN, PIN rail 4. Optical communication, solar industry: ceramic tubes, ceramic rods, circuit board screen printing ceramic scrapers 5. Heat-resistant and electrically insulating parts: ceramic bearings At present, aluminum oxide ceramics can be divided into high purity and common ceramics. The high purity aluminum oxide ceramics series refers to the ceramic material containing more than 99.9% Al₂O₃. Because of its sintering temperature of up to 1650 - 1990°C and its transmission wavelength of 1 ~ 6μm, it is usually processed into fused glass instead of platinum crucible: which can be used as sodium tube owing to its light transmittance and corrosion resistance to alkali metal. In the electronics industry, it can be used as the high-frequency insulating material for IC substrates. According to different contents of aluminum oxide, the common aluminum oxide ceramic series can be divided into 99 ceramics, 95 ceramics, 90 ceramics and 85 ceramics. Sometimes, the ceramics with 80% or 75% of aluminum oxide is also classified as common aluminum oxide ceramic series. Among them, 99 aluminum oxide ceramic material is used to produce high-temperature crucible, fireproofing furnace tube and special wear-resistant materials, such as ceramic bearings, ceramic seals and valve plates. 95 aluminum ceramics is mainly used as corrosion-resistant wear-resisting part. 85 ceramics is often mixed in some properties, thereby improving electrical performance and mechanical strength. It can use molybdenum, niobium, tantalum and other metal seals, and some are used as electric vacuum devices.
Fine Ceramics, Advanced Ceramics, ZrO₂
At Touchdown, many medical and ceramic products have been manufactured using zirconium oxide due to its superior characteristics and advantages, especially when the zirconium oxide and metal are combined. Zirconium oxide's low thermal conductivity and high endurance characteristic can easily offset ceramic's easy to break disadvantage.Zirconium oxide was found by Hussak in 1892. It exists in natural ore zircon sand or baddeleyite. Pure zirconium oxide exists in the form of monoclinic crystal, cubic crystal and cubic lattice. Zirconium oxide is characterized by high strength, high toughness, high hardness as well as excellent chemical corrosion and abrasive resistance.The world's 80% zircon sand producing areas are concentrated in Australia, South Africa and the United States. The methods of refining zirconia from zircon sand include chlorination method and pyrolysis method. It can be used in fireproofing materials, dewaxing casting and high quality powders. Major baddeleyite producing areas are concentrated in South Africa, Brazil and Soviet Union, and baddeleyite is mainly used in abrasive material and ceramic dye. Zirconium oxide exists in monoclinic crystal at room temperature, and will be converted into square crystal phase as temperature rises to 1170°C and then converted into cubic crystal phase as temperature rises to 2,370°C, while cubic crystal phase will be dissolved into liquid phase at 2,680°C, the conversion from square crystal into monoclinic crystal is a martensitic transformation, and such phase conversion may produce 3 - 5% volume change, resulting micro cracks. Later, magnesium oxide, calcium oxide and other phase stabilizing agents are added to make sure that zirconium oxide can maintain the high-temperature stable phase, that is cubic crystal phase, which is called the stabilized zirconium oxide; if yttrium oxide phase stabilizer is added to keep partial square crystal phase, it can be called partially stabilized zirconium oxide.Zirconium oxide thermal conductive ceramic ZrO₂ is pure white while yellow or gray containing impurities, and generally contains HfO₂, not easy to separate. The production of zirconia ceramics requires the preparation of narrow powder characterized by high purity, good dispersion performance, ultrafine particle and narrow particle size distribution. There are many methods to prepare superfine powder of zirconium oxide, and the purification methods of zirconium oxide mainly include chlorination and thermal decomposition method, alkali metal oxidation decomposition method, lime melting method, plasma arc method, precipitation method, colloid method, hydrolysis method and spray pyrolysis method.
Silicon carbide (SiC) features hardness second only to diamond and boron carbide and possesses high wear resistance, thus it's used for sliding parts (mechanical seals, etc.). In addition, it enjoys a high Young modulus and a small coefficient of thermal expansion, thus it's used for components (optical parts, substrates, etc.) that require high precision. Because it is a dense sintered body, it can be mirror-finished. It features high temperature resistance of over 1400°C and heat shock resistance with excellent chemical stability. It can be made into SiC glove, SiC sheath, sheet products and thick-walled products. Processed high purity SiC (high purity SiC) materials of DCG are often used as semiconductor manufacturing equipment parts.Silicon carbide (SiC) Precision Ceramic Processing: Silicon carbide (SiC) materials have higher mechanical strength than synthetic alumina and silicon nitride materials, especially in terms of high temperature resistance, wear resistance and corrosion resistance.Main Features: - Better wear resistance. - Better corrosion resistance. - Excellent oxidation resistance. - High thermal conductivity, good thermal conductivity. - Consistent strength under high-temperature environment. - High thermal conductivity, good thermal conductivity.Applications: - Grinder wear parts. - Ceramic bearings, heat exchangers. - Chemical pump parts, various nozzles. - High-temperature cutting tools, fire-resistant board. - Mechanical wear parts. - Steel reduction materials, arresters. - Other semiconductor manufacturing spare parts.
Silicon nitride ceramics are highly resistant to heat, shock and impact. Excellent heat resistance and impact resistance coupled with high strength make silicon nitride a priority for high temperature, high load applications.Common applications of silicon nitride ceramics: Semiconductor processing equipment, General industrial machinery, Heat-resistant parts.Silicon nitride is an important structural ceramic material. It is a super-hard atomic crystal material with lubricity, and wear resistance. It features anti-oxidation at high temperature and resistance to thermal shocks. When heated to 1000°C or above in the air, rapid cooling before heating rapidly will not cause fragmentation of it. It is because of the excellent characteristics of silicon nitride ceramic, people often use it to make bearings, turbine blades, mechanical seals, permanent molds and other mechanical components. If the heating surfaces of engine components are made of silicon nitride ceramics that are resistant to high temperatures and not easy to transfer heat, it can improve the quality of the diesel engine, save the fuel and improve thermal efficiency. China, the United States, Japan and other countries have already developed such diesel engine.
Quartz is a kind of glass like its name but what makes it different is that ordinary glass consists of many components, while quartz only consists of SiO₂. Because quartz contains very little amount of metallic impurities, only up to 10ppm (one hundred thousandth), the minimum state is usually only 10ppb (one over a billion) or less and because of its high purity, the quartz itself presents characteristics and advantages that other glass can not present.Quartz (SiO₂) material features extremely low thermal expansion coefficient, high temperature resistance, high abrasion resistance, good chemical stability, electrical insulation, low and stable retardation, near ultraviolet (infrared) ray visible light transmittance, high mechanical properties and so on.Therefore, high-purity quartz materials are widely used in modern electronic technology, semiconductor, telecommunications, electric light source, solar energy, national defense high-precision measuring instruments, laboratory physics and chemistry instruments, nuclear energy, nano-industries.Semiconductor Applications In the manufacturing process of semiconductor, the main quartz materials are used for quartz tube furnace, quartz boat, quartz ring, quartz tank, windows, process equipment and other related quartz components. Quartz processing include: surface grinding, polishing, cylinder cutting, cutting, groove processing, curve processing, special-shaped processing, ultra-fine hole drilling, film coating.