#aluminaceramic

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What Is The Outstanding Characteristics for ZTA?

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.   Below is the material properties for ZTA:

Properties

Unit

ZTA ceramic

Zirconia Content % 20% Color

white Volume density

g /cm3

4.1 Water Absorption % 0 Crystal Size（Grain Size） μm 5-6 Vickers Hardness, HV1.0 Gpa ≥15 Flexural Strength Mpa ≥500 Coefficient of linear expansion 20-500℃ 1x10-6mm/℃ 6.5~7.5 20-800℃ 6.5~8.0 Thermal conductivity W/m·K( 20℃) ≥20.9 Specific Heat Capacity KJ/(kg*K) ≥0.8 Dielectric Strength KV/mm ≥9 Volume resistivity Ω·cm 20℃ ≥1014 Ω·cm 300℃ ≥1011 Ω·cm 500℃ ≥109 Dielectric Constant 1MHz 9-10 Tangent Of Dielectric Loss 1MHz ≤5x10-4 Surface Roughness μm 0.1-0.4 after the machine           Read the full article

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How to use Alumina Ceramic Tubes for long-term use

Alumina ceramic is widely applied in the high-temperature industry because of its excellent resistance to high temperatures. It can withstand high temperatures up to 1800℃, in addition to its stable chemical properties, high mechanical strength, and electrical insulation. So Alumina ceramic tube is commonly used in high-temperature furnaces, thermocouples tubes, insulating tubes, and corona electrode's square ceramic tubes. In this articles, we would like to discuss how to use alumina ceramic tubes at high temperatures to ensure optimal performance and longevity.

1. Proper handling and storage Alumina tubes are brittle, avoid any sudden impacts or shakes to prevent breakage. During storage, it should be stored in a dry and clean environment to prevent contamination. 2. Preheating When using alumina tubes, we should be preheated gradually, the heating rate should be controlled at 5 degrees per minute until it reaches the desired temperature, the slower the better. 3. Cleaning Before using aluminum oxide tubes, it is important to clean them thoroughly to remove any impurities or residue. Any foreign matter on the surface of the tube may cause contamination or blockage during use. A combination of solvents, detergents, and/or acid solutions can be used to clean the tubes. After use, don't leave some samples in the tube to avoid chemical reactions that may cause the alumina tube to crack. 4. Heating When placing or removing the sample, do not exceed 150 degrees and move slowly from the edge to the center. Placing or removing samples at high temperatures is the main cause of alumina tube breakage. Do not touch the high temperature furnace tube with low temperature objects. Repeated thermal cycling can stress the aluminum oxide tubes, causing them to crack or even fail completely. So it is recommended to use the alumina tube at a steady temperature without any sudden changes. 5. Cool down After use, it is important to cool the aluminum oxide tube slowly to avoid thermal shock. Rapid cooling can cause the tube to crack or even fail completely. It is recommended controlled at 5 degrees per minute until it reaches room temperature.

In conclusion, proper handling, preheating, cleaning, heating, and cooling are essential to ensure optimal performance and longevity of the tube. Read the full article

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What's The Differences Between Alumina Ceramic And Zirconia Ceramic

Alumina is a very common technical ceramic material. Zirconia is also widely used in machinery industries. As an advanced ceramics manufacturer, we'd like to introduce the differences between alumina ceramic and zirconia ceramic.

In terms of performance: 1.The density of zirconia ceramics is twice that of alumina ceramics, the bulk density of zirconia is 6.05g/cm3, while that of alumina is only 3.7g/cm3. So zirconia has better compressive properties in comparison. 2.The toughness of zirconia ceramics is 4 times that of alumina ceramics. The toughness of the zirconia ceramic is excellent, which overcomes the inherent brittleness of the ceramic itself, has higher wear resistance, and greatly extends the service life of the product. 3.Zirconia parts with higher surface finish. After grinding and processing of two materials, zirconia has a higher surface finish, and the roughness can reach about Ra0.02. The surface is mirror-like, very smooth, and has a smaller coefficient of friction. But alumina roughness is about Ra0.2~Ra0.4. 4.Zirconia ceramics have excellent thermal insulation, and its thermal conductivity is less than one-tenth of the thermal conductivity of other ceramics. In terms of price: The price of alumina is lower than that of zirconia. One of the reasons is the cost of the raw material, another reason is the high processing cost of zirconia ceramics. In terms of applications: 1.Alumina ceramic could withstand higher temperature, application in industry furnace. 2.As the wear resistance for zirconia is much better, it is frequently used as mortar and pestles, grinding jars and grinding media, bearing balls and ceramic parts in valves and pumps. 3.Zirconia has better corrosion resistance. Zirconia could survive longer in highly corrosive environment and is considered better material in chemistry laboratories. So Zirconia ceramics are suitable for applications in high-load, high-strength, and chemically corrosive environments, while alumina ceramics are suitable for applications with low loads, high temperatures, and heat dissipation. Read the full article

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Alumina Ceramic Crucibles

Alumina ceramic crucibles are used in scientific experiments and materials such as molten metals. Made of 95 alumina ceramics, it has high temperature and corrosion resistance and lasts longer than other materials. In addition to alumina crucibles, we also have zirconia. We offer a wide range of ceramic melting enamels to meet all your smelting or casting needs. Custom-sized ceramic enamels are also available upon request. Read the full article

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Spark plugs and ceramics - an unexpected combination of life

Spark plugs are an integral part of the motorization era. Everyone travels every day, and there are countless small spark plugs that support this vast modern society. Today, I will tell you about the application and role of ceramic products in spark plugs. The unexpected combination of ceramic and spark plugs is practical, economical, and efficient.

This image was posted by Alexander Waturandang on Pixabay A spark plug is an integral part of a gasoline engine ignition system that introduces a high voltage current into a cylinder to create an electrical spark to ignite a combustible gas mixture. The main components are the wiring nut, the insulator, the terminal screw, the centre electrode, the side electrode, and the outer casing, wherein the side electrodes are welded to the outer casing. The ceramic material acts as an insulator in the spark plug.

This image was posted by Thomas Wolter on Pixabay The surface of the ceramic part as an insulator has a plurality of groove-like corrugations for preventing arc generation, that is, preventing sparking between the terminal nut and the main metal (because the terminal nut and the main metal are in ignition) High voltage electricity is generated and the high voltage electricity attempts to slip along the surface of the insulator. In order to block high voltage electricity, a layer of ditch is provided. Insulation, heat resistance, and thermal conductivity are characteristics of alumina ceramic materials. Alumina ceramic is a ceramic material with α-Al2O3 as the main phase. The alumina content of the alumina ceramics used in engineering is usually between 75% and 99.9%. It is usually classified according to the content of Al2O3 in the composition. Al2O3 porcelain is widely used, and its properties depend on the content of Al2O3. Usage is also different.

This image was posted by Manfred Richter on Pixabay High mechanical strength The bending strength of Al2O3 porcelain sintered products can reach 250MPa, and the hot pressing products can reach 500MPa. The purer the Al2O3 component, the higher the strength. The strength can be maintained to 900℃ at high temperatures. High resistivity and good electrical insulation performance The normal temperature resistivity is 1015 Ω·cm and the dielectric strength is 15 kV/mm. With its insulation and strength, it can be used to make substrates, sockets, spark plugs and circuit casings. High hardness Mohs hardness is 9, plus excellent wear resistance. What’s more advantage of alumina? High melting point and corrosion resistance; excellent chemical stability; optical properties and ionic conductivity.

This image was posted by Steven Liao on Pixabay After the above introduction, I believe that the reader has a preliminary understanding of the performance of alumina ceramics. Alumina ceramics are ideal for spark plugs due to their high electrical resistivity and excellent electrical insulation properties. Small body, full of energy. Small ceramic parts drive our society and power our lives. Read the full article

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Advanced Ceramics Is The Most Potential Development In New Materials Field

According to the preparation technology and application field of ceramics, ceramics can be divided into traditional ceramic materials and advanced ceramic materials. Advanced ceramics have gradually become an important part of new materials. Advanced ceramics: according to chemical composition can be divided into oxide ceramics, nitride ceramics, carbide ceramics, boride ceramics, silicide ceramics, fluoride ceramics, sulfide ceramics, and so on. According to its properties and uses, it can be divided into two categories: energy ceramics and structural ceramics. Functional ceramics are mainly based on the special functions of materials, with electrical properties, magnetic properties, biological properties, thermal sensitivity, optical properties, and other characteristics, mainly including insulating and dielectric ceramics, ferroelectric ceramics, piezoelectric ceramics, semiconductor, and sensitive ceramics, etc. Structural ceramics are mainly based on the mechanical and structural uses of materials, with high strength, high hardness, high-temperature resistance, corrosion resistance, oxidation resistance, and other characteristics.

Advanced Ceramics Is The Most Potential Development In New Materials Field Structural ceramics with their excellent mechanical and thermal properties become an important branch of ceramic materials, accounting for about 30% of the whole ceramic market. In nearly 20 years, the national major projects and cutting-edge technology in ceramic material and its preparation technology is also put forward higher demands and challenges, such as aerospace rocket liquid hydrogen in liquid oxygen turbine pump use of silicon nitride ceramic bearings under the condition of low-temperature extremes no-slip condition at high speed, requirements at the beginning of the ceramic bearing high strength, good, wear resistance, surface processing of high precision; The large size ceramic sealing ring used in the main pump of nuclear power plant needs long service life and high reliability. In particular, the silicon carbide ceramic reflector used in the ground monitoring of the earth satellite shooting targets, in addition to high elastic modulus, low thermal expansion coefficient, and lightweight, requires high precision ultra-mirror and large size. This is a challenge to the molding technology, sintering technology, and processing technology of large-size structure ceramic materials. In optical communication, the inner hole of the optical fiber connector is 125 microns, and it requires a very high surface finish, dimensional accuracy, and concentricity. So Structural ceramics is the most promising quality material in an extreme environment. For the oxide ceramics, nitride ceramics in structural ceramics, below is their feature: Alumina ceramics: the earliest and most widely used structural ceramics Zirconia ceramics: high-performance structural ceramics, toughening is the key to preparation Beryllium oxide ceramics: oxide ceramics with the highest thermal conductivity, Silicon nitride ceramics: one of the materials with the best comprehensive properties in advanced ceramics Aluminum nitride ceramics: ideal structural material for microelectronics industry circuit board and packaging Boron nitride ceramics: soft ceramics in ceramic materials, good machinability Read the full article

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What are the defects on the surface of alumina ceramics?

Alumina ceramics is a kind of ceramic material with Al2O3 as the main raw material. It has many advantages, such as high mechanical strength, high hardness, and low dielectric loss at high frequencies, so it is widely used in the fields of electronics, electrical appliances, machinery, textiles, and aerospace. But do you know what is its defect?   Alumina ceramics have a series of production processes. During the process, materials will come into contact with machinery, equipment, tools, utensils, and the environment. Therefore, there are many factors that cause pollution and quality problems in ceramic parts. In general, the common quality problems related to color after sintering of alumina ceramics are: (1) There are spots on the surface, such as black spots, brown spots, and red spots; (2) There are plaques on the surface, such as dark plaques, black plaques, bright plaques, etc.; (3) Ceramic parts have chromatic aberration, such as overall yellowing or graying;   Innovacera has extensive experience in the manufacture of alumina ceramics and we have a lot of solutions to avoid the above issue. What are the defects on the surface of alumina ceramics？

What are the defects on the surface of alumina ceramics？

What are the defects on the surface of alumina ceramics？ Read the full article

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The Application of Alumina and SiC Porous Ceramics

Application: Semiconductor wafer processing, laser numerical control processing, PCB, flexible screen, precision grinder, air floating platform, air bearing, optical components. 1) The smaller the pore size, the greater the resistance and the greater the degree of vacuum required, but the greater the suction power obtained. 2) The maximum use temperature of alumina/silicon carbide microporous ceramics is about 1000 ° C, and the maximum use temperature is also related to size and shape. Still, if glue is stuck, it can only be lower than 100 ° C. 3) Microporous ceramics generally do not mention the roughness problem, because there are micropores, but the surface smoothness is similar to Ra0.8 of dense ceramics. 4) Low thermal conductivity. Only dense materials will have high thermal conductivity. 5) Microporous ceramics cannot be used in a humid environment or come into contact with conductive liquids. Otherwise, they will not be insulated. Read the full article