5) The unique air circuit design and packaging process of aviation aluminum alloy base can realize selective vacuum area adsorption.
Application field of porous ceramic vacuum chuck
1). It can absorb OLED, LCD, wafers, and other smooth and flat objects.
Please note: the contact area between the adsorbed substance and the ceramic should not be less than 10*10mm (the larger the adsorption area, the stronger the adsorption force).
When absorbing objects, it is not necessary to cover the unused area.
2). It can be used in both directions. Adsorption by vacuum and suspension of objects by positive pressure
Porous Ceramic Steel Disc
How to use the porous ceramic vacuum chuck
As shown in the figure, the internal structure of the vacuum chuck is divided into three areas: A, B, and C. When each area is vacuumed separately, the area covered by the ceramic can form a strong negative pressure.
Connect the three area air pipes in parallel to a vacuum generator, and install a solenoid valve as required.
Connect the air source (above 0.6Mpa), and open the air circuit in the corresponding area according to the size of the object.
POROUS CERAMIC VACUUM CHUCK Equipment
Precautions in the use of porous ceramic vacuum chuck
1). Do not blow air under positive pressure. (If there is a need for air suspension, it can be customized)
2). Handle with care, do not scratch or hit the ceramic surface with hard objects, to prevent deformation from affecting accuracy and ceramic cracking.
3). Do not heat, the thermal shrinkage of the aluminum alloy /stainless steel base may cause the ceramic extrusion to crack.
4). It should not be contaminated with oil, glue, paint, and other pollutants, and should be used in a dust-free and oil-free environment as much as possible to prevent micropore blockage.
5). If there is dust and dirt on the surface, it can be pasted and removed with non-residual adhesive tape multiple times, or washed with a high-pressure water gun.
Ceramic toughness: The toughness of zirconia ceramics is 4 times that of alumina ceramics. At the same time, when zirconia is dropped freely from a height of one meter, there will be some gaps, and the alumina will be broken.
Density: The density of zirconia ceramics is twice that of alumina ceramics. In contrast, zirconia has better compressive properties.
Friction coefficient: The friction coefficient of zirconia ceramics is only half of that of alumina ceramics, and the elastic modulus and hardness are mainly considered in the actual use process.
Density and surface finish: The density of zirconia ceramic structural parts is higher than that of alumina ceramics. After grinding, the surface finish is higher, up to Ra0.2 or more, mirror-like, extremely smooth, and has a smaller friction coefficient.
The lattice of zirconia ceramics is stable at high temperatures, and the lattice phase is damaged once it reaches normal temperatures. Therefore, 94.8% of zirconia reaches a stable state at room temperature, and a 5.2% stabilizer must be added. The powder is dry-pressed and sintered at 1560 ℃, the hardness and toughness will exceed 99% alumina ceramics, and its wear resistance and impact resistance will exceed 99% alumina ceramics. If no stabilizer is added, the ceramic is easy to crack, so zirconia balls are used as abrasive materials because they have great hardness and toughness.
What are the advantages of zirconia ceramics over alumina ceramics？
Contact us if you want to know how our materials can offer you a solution.
There are three variants: hexagonal, hexagonal close-packed, and cubic.Hexagonal crystal BN is a stable phase at normal pressure;close-packed hexagonal crystal BN and cubic crystal BN are stable phases at high pressure, and metastable phases at normal pressure;
hexagonal crystal boron nitride transforms into cubic crystal nitrogen at high temperature and high-pressure boron nitride or close-packed hexagonal crystal boron nitride.
Hexagonal crystal boron nitride has a layered structure similar to graphite, its color is white, and its performance has many similarities, so it is also called “white graphite”.
The manufacturing process of boron nitride ceramics
(1) Preparation of boron nitride powder:
① boron halide method
This method is also called the gas-phase synthesis method. The boron halide reacts with ammonia to form an intermediate amino complex, and then the intermediate is processed at a high temperature to obtain BN. At 125~130°C, the intermediate object decomposes into B2(NH)3, and when it is heated to 900~1200°C, B2(NH)3 is decomposed into BN.
② Boron anhydride method
By reacting boron anhydride with ammonia at high temperatures,
By reacting boric anhydride with sodium cyanide (calcium),
By reducing boron anhydride with graphite in a graphite crucible
In order to obtain dense boron nitride, hot pressing is mainly used. Boron nitride ceramics can also be formed by various molding methods according to different shapes and sizes.
In order to facilitate the sintering of boron nitride, a certain amount of additives can be added. Commonly used additives include B203, Si3N4, AIPO4, BaCO3, etc.
The amount of B2O3 added to the additive should be appropriate. The presence of B2O3 will cause the boron nitride ceramics to absorb moisture and lead to a sharp deterioration in electrical and thermal properties;
If BaCO3 is added, the performance of hot-pressed boron nitride ceramic products can be improved.
Properties and applications of Hexagonal boron nitride Ceramic
Properties
Applications
White in color, stable in performance, and good in machinability
used as a high-temperature lubricant
high-temperature resistance and insulation
used as an electrical insulation material
Thermal conductivity and penetrating performance to microwave radiation
used as a transmission window for radar in the electronics industry
used as a structural material for nuclear reactors in the atomic energy industry
High melting point, small thermal expansion coefficient, and stable to almost all molten metals,
used as a high-temperature metal smelting crucible, heat-resistant material
Used as a heat sink and heat conduction material (temperature up to 2800°C in the neutral or reducing atmosphere)
used to make the separation ring of the crystallizer in the billet horizontal continuous casting technology in the metallurgical industry
The best material for manufacturing engine parts, widely used in defense industry and aerospace
Manufacturing and Application of Boron Nitride Ceramics
Innovacera develops many kinds of Zirconia ceramic parts for all kinds of pumps & valves. Such as waterjet zirconia ceramic plunger for severe service and high-pressure systems.
Ceramic pumps and plungers are the ideal replacements for the metal in high pressure, high wear, high temperature, saltwater, chemical, and metering applications.
The waterjet intensifier ceramic plunger for the water jet is used on 60k ultra high-pressure intensifier waterjet pump 50HP, 60HP,100HP, 40KPSI, and 60KPSI.
The max pressure it undertakes can be 60 Kpsi , voltage of 220v/380v.
The ceramic connects with the metal cap by heat shrinkage, it is the strongest assembling ceramic to metal, and not easy to fall apart. The surface of the zirconia rod is mirror polished, with fine surface roughness, so it is wear-resistant and can work for a long time. And zirconia ceramic material with good toughness and fracture strength. Below is the waterjet cutter machine intensifier pump structure with a zirconia ceramic plunger for reference:
Mirror polished
High-pressure resistant
Wear and corrosion resistant
Long Service Life & improve seal life
Good toughness and fracture strength
10 years of expertise in manufacturing zirconia pump components for OEMs
ZTA (Zirconia Toughened Alumina) is a composite material made from alumina and zirconia. It combines the outstanding characteristics of both materials.
Compared to conventional alumina, ZTA possesses superior hardness, higher flexural strength, and similar density. Compared to conventional zirconia, it possesses a lower coefficient of linear thermal expansion and higher thermal conductivity.
By leveraging these features, ZTA has been widely adopted in milling parts and wear-resistant parts that require cooling.
ZTA (Zirconia Toughened Alumina)
Features:
High Stiffness and Outstanding Wear Resistance
Stiffer than alumina with outstanding wear resistance equivalent to zirconia.
High Thermal Conductivity and Low Thermal Expansion
Suppresses thermal deformation through thermal conductivity and low thermal expansion equivalent to alumina. Suitable for components requiring a cooling Mechanism.
High Strength and Specific Rigidity
Approximately twice as strong as alumina and contributes to low-weight design through high specific rigidity.
The working temperature of the boron nitride ceramic crucible is 1900°C under vacuum and 2100°C under atmosphere protection. Nitrogen or argon atmospheres are best, it makes have the longest life.
The boron nitride crucible has strong thermal shock resistance, 1500°C fast cooling without cracking, and 1000°C furnace holding for 20 minutes, taking it out and blowing and fast cooling for hundreds of times continuously without cracking.
Note:
1. The use temperature in the air should not be more than 900 °C, and the surface of boron nitride and oxygen will be oxidized and peeled if it exceeds 900 °C.
2.Boron nitrideis easy to absorb moisture. The crucible can’t be stored in wet areas and can’t be washed with water. It can be directly wiped with sandpaper or scrubbed with alcohol.
3. Application direction of boron nitride crucible
The story of advanced ceramics is an interesting story of how the creation of technical ceramics and the discovery of the potential for various uses of technical ceramics can influence the development of many different industries that use advanced ceramics in their everyday operations. Continue reading →
Innovacera Advanced Materials is pleased to offer new standard filament assy supports, a critical component in mass spectrometry applications for the analytical and medical industries.
With the development of technology, metal-ceramic composites have become more and more popular in the application of vacuum feedthrough, co2 lasers, and printing of circuit boards, high power microwave environment, which requires high purity alumina ceramic transmit microwave power well. It requires the ceramic dielectric constant in a stable range. Innovacera ceramic parts have made the parts successfully to meet the customer application requests.
There are many metal-ceramic composites such as thyristors and vacuum interrupters used in high vacuum technology(HVDC-high voltage direct current transmission, vacuum technology ). Using primarily aluminum oxide ceramics and various non-ferrous metals, such as OF Cu( oxygen-free copper ) or Nico(nickel-cobalt ), soft magnetic alloys, NiFe (nickel-iron ), or stainless steel ( 316L), as connecting agents. As a material–logical connecting technology, both passive and active brazing techniques are used, with this, high-strength composites can be produced which are permanently proof and vacuum-tight in the temperature range from -150℃ up to +500℃.
If you want to know more information, pls contact with us.
Ceramic to Metal Assemblies are produced by Innovacera
Innovacera Ceramic Thermally Conductive Interface Pads are designed to provide a preferential heat-transfer path between heat-generating components, heat sinks, and other cooling devices. The pads are used to fill air gaps caused by imperfectly flat or smooth surfaces which should be in thermal contact. The pads are made of ceramic materials such as alumina ceramic and aluminum nitride, which help in providing enhanced thermal conductivity and excellent insulation performance. Typical applications include Power Devices, Integrated Circuit (IC) chip packaging heat conduction, MOSFET Transistor, IGBT Transistor Heat Sink, MOS Transistor, heat sink interface, LED board Thermal Interface Material (TIM), Chip ON Film (COF) heat conduction.
TO-3P-220-247-254-257-258-264 Aluminum Nitride Ceramic Thermal Pads Without Hole For MOSFET Transistor IGBT Transistor Heat Sink
A ceramic heat sink is a device that dissipates heat-dissipating electronic components in an electrical appliance.
The whole structure of the ceramic heat sink increases the heat dissipation area in contact with the air, which greatly enhances the heat dissipation effect, and the heat dissipation effect is better than that of the super copper and aluminum.
Ceramics are insulated, resistant to high temperatures, oxidation, acid and alkali, cold and thermal shock, and low coefficient of thermal expansion, ensuring stability in high and low temperatures or other harsh environments.
Ceramics can withstand high current, can be high voltage, can prevent leakage breakdown, no noise, will not generate coupling parasitic capacitance with power tubes such as MOS, and thus simplify the filtering process.
Aluminum nitride ceramic thermal insulator pads are ceramic materials with outstanding properties such as high thermal conductivity and high electrical resistance. In addition, it is featured advantages such as high hardness, corrosion resistance, low dielectric constant and dielectric loss, and low CTE. Aluminum nitride ceramics have excellent thermal conductivity (7-10 times that of alumina ceramics), as the thermal expansion coefficient of silicon is similar, as a new generation of ceramic materials, more and more people pay attention to it.
Ceramic Thermal Pads Installation Steps:
①Clean the target surface: Clean the dust or stains on the surface of the object to be installed, and then align the hole position of the ceramic insulating sheet;
②Power tube bonding: Stick the power tube on the ceramic insulating sheet;
③Fixed the insulation sheet: Use screws to fix the power tube and ceramic insulating sheet on the installation object.
Regular Size：
For Package Type: TO-3P / TO-220 / TO-247 / TO-264 / TO-3/TO-254/TO-257/TO-258, With Hole or Without Hole.
TO – 3P, 25*20*1mm (other thickness is available, too);
TO-220, 20*14*1mm (other thickness is available, too);
TO-247, 22*17*0.635mm (other thickness is available, too);
TO-264, 28*22*1mm (other thickness is available, too);
TO-3, 39.7*26.67*1mm (Rhombus shape).
TO-254, 34*24*1mm (other thickness is available, too);
TO-257, 40*28*1mm (other thickness is available, too);
TO-258, 50.8*50.8*1mm (other thickness is available, too);
Smooth surface, no dirt, water stains, watermarks, no chip, cracks, edge breakage, scratches, and other defects
6
Clean request
After ultrasonic cleaning, clean again with alcohol, dry, and bake in time to ensure that there are no water stains and watermarks on the surface
7
Package request
After machining, products are placed in special pearl-cotton packaging boxes as required for turnover and transportation to avoid defects such as bruises and scratches.
ALN Product Package requirement:
(1) The product is cleaned according to the requirements, after completely dried, placed in the special pearl cotton packaging box,
(2) One group of 100 pieces of products is placed in the small cells in the packaging box. There are 5 cells in each packaging box, and 500 pieces can be placed in total (as shown in the picture).
(3) After each version of the packaging box is filled with products, it needs to wrap the film tightly, and attach the quantity label (Picture);
(4) Put the pearl-cotton packing box into the outer carton, and paste the specification and quantity label on the surface.
(5) Package carton size: 21*21*12cm
(6) Gross weight: 1.5kgs
TO-3P-220-247-254-257-258-264 Aluminum Nitride Ceramic Thermal Pads Without Hole For MOSFET Transistor IGBT Transistor Heat Sink Package
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