Blue Zirconia have excellent properties such as drop resistance, wear resistance, super strength, super hard, high temperature resistance (fire resistance), supercorrosion resistance, oxidation resistance, insulation, and self-lubrication. No matter the sun or rain (Even acid rain), or moisture has no effect on the surface and substrate. Ultraviolet radiation resistance and color stability fully reach the international Gray scale 4-5 degree and has high impact resistance. The high dense material makes surface difficult for dust, making it easier to clean.Blue zirconia ceramics are more wear-resistant than other colors Zirconia.
Precision metering pump with plungers apply for precise measured filling of fluids and high-purity liquids. The ceramic plunger pin and sleeve are much matched, No required with dynamic sealing ring. Good property of durable, and low wear rate in appilcation.
MgO-ZrO2 is toughened zirconia ceramics and produced by magnesium oxide as a stabilizer. Compared with ordinary yttrium-stabilized zirconia, Under severe conditions Mg-psz has phase transition caused by a series of change, such as pressured water vapor and humidity or acid-base solutions at a certain temperature. In this process it has excellent high temperature stability, chemical stability, and excellent mechanical properties aging resistance. It is the best material for chemical industry, food industry, liquid sealing, fluid filling, medical equipment, petrochemical industry, etc. The performance of Mg-psz made by XYC has yellow color and white color, which have exceeded international level of the same type of advanced materials. it is the best stable material in kinds of fine ceramic.
1.1 High temperature strength of ceramics The high temperature resistance of structural ceramics is generally better, usually below 800°C, and temperature has little effect on the strength of ceramic materials. Compared with covalent bond ceramics, ion-bonded ceramics have poorer high temperature resistance. Generally speaking, in the lower temperature range, the fracture failure of ceramics is brittle behavior, that is, there is no plastic deformation, and the ultimate strain is very small, and it is very sensitive to small defects. However, in the high temperature zone, ceramics can produce small plastic deformation before fracture, the ultimate strain is greatly increased, and there is a small amount of elastoplastic behavior. In addition, the sensitivity of strength to defects varies greatly. The boundary between the low temperature zone and the high temperature zone that produces this material property change is usually called the brittle ductility transition temperature. The brittle ductility transition temperature is closely related to the ceramic chemical composition and the type of valence bond. Relevant, but also related to the microstructure of the ceramic, the composition of the grain boundary phase, especially the composition and content of the grain boundary glass phase. At high temperatures, above the brittle ductility transition temperature, the strength of most ceramic materials will decrease. For ion-bonded MgO ceramics, the brittle ductility transition temperature is very low, and the strength decreases with the increase of temperature almost from room temperature. The brittle ductility transition temperature of Al2O3 is about 900°C, the brittle ductility transition temperature of hot-press sintered Si3N4 is about 1200°C, and SiC ceramics can often withstand high temperatures of 1600°C. At high temperatures, the strength of most ceramic materials decreases with increasing temperature. Figure 1-33 shows the change in bending strength of some typical structural ceramics with temperature. However, some ceramics have a rebound strength near the brittle ductility transition temperature, such as silicon carbide and mullite ceramics. This phenomenon is related to the viscous effect of the glass phase in ceramics, that is, when approaching the brittle ductility transition temperature, the strength of the glass phase has not yet decreased but the viscosity is just reduced to relax the concentrated stress at the crack tip, which improves the resistance to crack growth. At this time, the influence of micro-cracks is minimized. Figure 1-33 The influence of temperature on the bending strength of structural ceramic materials Zirconia toughened alumina ceramics (ZTA) has the following characteristics in terms of its strength changing with temperature: in the range of normal temperature to 300C, the strength of various ZTA ceramic materials decreases by an average of 30%; in the high temperature zone of 800-1400°C, the strength decreases About 40%, and in the middle temperature section, the intensity changes little, as shown in Figure 1-34. If ZTA is compared with Al2O3, ZTA material is not suitable for high temperature occasions, and its strength decline is much more serious than that of Al2O3. The high-temperature strength of carbide and nitride ceramics is relatively high. For example, some hot-pressed and atmospheric sintered or recrystallized silicon carbide ceramics maintain their flexural strength at 1500°C. Table 1-21 lists the service temperature of typical structural ceramic materials. It can be seen that the long-term use temperature under load is very different from the short-term use temperature under no load. The former is lower than the latter by several hundred degrees (Morrell, 1989). Such as refractory high-purity Al2O3 ceramics, the long-term use temperature is only 1400°C under load, and the short-term use temperature reaches 1900°C under no load; the hot-pressed dense sintered SiC ceramics, the long-term use temperature under load is 1500C, The short-term use temperature under no load is 2100°C. In addition, different ceramic materials have different creep temperatures under load. Covalently bonded SiC and Si3N4, non-oxide ceramics, and non-oxide ceramics usually appear at a creep temperature above 1600 °C, and ionically bonded oxide ceramics appear to creep. The temperature of change is usually around 1000°C.
2021 Shenzhen International Additive Manufacturing, Powder Metallurgy and Advanced Ceramics Exhibition (abbreviation: Formnext + PM South China) Formnext + PM South China is the premier industry event in powder metallurgy, advanced ceramics and additive manufacturing industries, attracting domestic and foreign exhibitors to approach 200 exhibitors, with an exhibition area of 15,000 square meters, invite 7,647 professional visitors on the first day of opening! 17,902 people watched the live broadcast. Jointly organized by Xinzhilian Yilisi (Shanghai) Exhibition Service Co., Ltd. and Guangzhou Guangya Messe Frankfurt Co., Ltd., the exhibition will run through a series of advanced materials, technologies, and equipment such as advanced ceramics, powder metallurgy, additive manufacturing and post-processing. As well as products, it will bring new business opportunities to the manufacturing industry in China and even Asia. This exhibition gathered many well-known companies in the industry. Guangdong XY Fine Ceramics Technology Co., Ltd. was also honored to have the opportunity to participate in this exhibition and exhibited the company's advantage products at booth B77 in Hall 9. Customer visiting exhibition site Staff style The first Shenzhen Formnext + PM South China officially came to an end. Looking back at the scene, it seemed that the voices of the people were still full of voices, and the exhibitors kept coming back and forth. XY made an appearance with 20 years of professional finishing ability, excellent product quality, high-quality service and unique innovative ideas, and communicated, communicated and negotiated with customers who came to visit, which further improved the company's reputation and influence, and also further Understand the new market situation in the advanced ceramics field, and lay a solid foundation for perfecting its product structure and opening up the market.
The way of coloring of ZrO2 ceramics? (1)Solid form mixing method (2)Chemical coprecipitation The chemical co-precipitation method is to use zirconium salt, stabilizer salt and coloring ion salt solution to mix, through the reverse position with alkali or carbonate, altogether generate double oxide or salt precipitation, and then heat and decompose to obtain oxidation Composite powder, Japan Toh Fuisaki et al. (200 successfully developed a black zirconia ceramic containing 2% ~ 6% (wt) colorant. The colorant is a spinel structure (Co-Zn,) (Fe-, AL) ,)2O4,(0≤x≤0.5,0≤y≤0.5). Co, Zn, FeAl colored zirconium oxide is obtained by co-precipitation method. This black zirconium oxide has a deep black color with jewel luster, and the color is very good for sintering. It is not sensitive to temperature changes and can be sintered at 1300~1500C without changing the color of the product.The chemical co-precipitation process is more complicated, but the obtained powder has high purity and excellent performance. However, the disadvantage of this method is that the complex co-precipitation ions of colored zirconia lead to complex reactions in the later sintering process. The zirconia stabilizer may react unexpectedly with colored ions, which affects the performance of the final colored zirconia product. On the other hand, it also affects the color rendering optical performance of the colored ions. In addition, this method is prone to agglomeration during the reaction process, and the dispersion of the prepared powder is poor, which affects the performance of the ceramic. In order to avoid the agglomeration of the powder, in the powder preparation process, the dispersant, surfactant and auxiliary agent are appropriately added to control the dispersibility and particle size of the powder. (3)High temperature carburizing/nitrogen method The high-temperature carburizing/nitriding method is to process the zirconia ceramics into shape and degreasing, and then carry out a low-temperature unprotected atmosphere bisque treatment, and then the treated zirconia cord-fired body is sintered at a high temperature under vacuum protection conditions. When placing the sample during sintering, a graphite crucible is used, and graphite paper is placed on the surface of the sample, and the carbon evaporated at high temperature is used to infiltrate the oxide surface to realize the black coloring of the oxide bonded ceramic (Zhong2005). The disadvantages of this method Yes: High requirements for equipment and vacuum environment: The color is mainly on the surface of the oxidized product: the black is not bright enough, and it may gradually fade during use. Miol 200 from Asurabu, Switzerland, uses high-temperature plasma nitriding to prepare golden oxide Hao ceramics. The sample of annual pottery is placed in a reaction vessel. The vessel contains ammonia and emotional gases. The mixed gas, nitrogen, hydrogen and the combined gas of your body, or the mixture of these two mixed gases produces a plasma, which will cause the surface layer of the product to form zirconium nitride (ZrN) or zirconium oxynitride after about 15-240min . Wang and Xie (2009) of Tsinghua University used a non-uniform precipitation method to synthesize colored zirconia ceramics to overcome the serious internal problems of colorant volatilization caused by the solid phase mixing method and the shortcomings of complex reactions and difficult to control. They successfully prepared ZrO2 ceramics in various colors such as blue, black, pink, and cyan. The method is to coat a layer of colored ion hydroxide on the surface of ZrO2 powder, which can greatly shorten the mass transfer distance of colored ions during sintering. Therefore, in the crucible prepared by the heterogeneous precipitation method, the volatilization of colored ions or the reaction with the crucible are basically not observed after sintering, and the color obtained is uniform and consistent. Shows the prepared brilliant blue zirconia ceramic ring. The scanning electron micrograph of its internal microstructure is shown in the figure. It can be seen that CoAl2O4 and spinel crystals with coloring function are dispersed in uniform zirconia crystal grains. Excerpts from "Structural Ceramics" Author: Tsinghua University Professor Xie
Ceramic coloring mechanism Color is another optical property that enables ceramics to have many applications. When certain ions in the ceramic material contain electrons that are easy to excite, the light in the visible light range may be absorbed. At this time, the ceramic shows a color. This situation mainly occurs in transition elements with single-filled d-layers (such as v.Cr, Mn.Fe.Ni.Cu. or f-layers (rare earth elements)), which are relatively unstable. They have higher energy and require more It can be excited with less energy, so it can selectively absorb visible light, such as C+ ions, and slightly collect orange, yellow and part of the green light, showing a purple blue; Ni2+ absorbs other light through purple and red light to form purple gray; Cu+ Ions absorb red, orange, yellow and violet light, allowing blue and green to pass through: rare earth elements such as Ce have a plume absorption at the blue-violet place, appearing yellow; Nd3+ (neodymium) absorbs orange and yellow, appearing reddish purple. 1.Coloring of Alumina Al2O3 often need to be colored in practical applications, and they can show different colors by introducing colored ionic compounds. For example, in semiconductor integrated circuits, the alumina used as the package shell should have light-shielding properties. Therefore, the Al2O3 of the digital tube backing plate is also required to be black to ensure clear digital display. For this reason, Fe2O3, CoO.Cr2O3, TiO2, MnO and other colored oxides can be introduced into Al2O3. The black color of Al2O3 ceramics is due to the fact that Ti+ in the ceramic is partially reduced to Ti4+ under the action of reducing atmosphere (H2) and high temperature. Ti3+ can actually be regarded as T1+ that binds electrons, that is, Ti4+e-. This bound electron is Weakly bound electrons can be regarded as the "color center" in TiO2, so this type of ceramic appears black.Another commonly used red-purple Al2O3 is the introduction of Cr2O3 and MnO into Al2O3 ceramics. Containing about 1% Cr2O3, Al2O3, ceramics often appear red, because the Cr3+ ion in the solid solution α-Al2O3 lattice has a strong selective absorption of the blue-green band of visible light, so that the body presents a blue-green complementary color , Which is pink. 2. Coloring of Zirconia The colorful colors greatly broaden the application fields of polycrystalline zirconia toughened ceramic materials. At present, zirconia have black, blue pink, green, cyan, gold and other colors. Its products involve watch cases and bracelets in the watchmaking industry, high-end mobile phone shells and buttons, ceramic knives used in the kitchen, and imitation gems. Kind of zirconia rings and necklaces, etc. Traditional watch cases and bracelets are made of metal and electroplating. This kind of watch cases and bracelets are prone to plating peeling off and rusting. After a long period of use, the phenomenon of wear is particularly prominent. The case and bracelet made of colored zirconia have many excellent properties: for example, excellent wear resistance, the weight reduction of the watch, the hardness is about 10 times that of stainless steel, and the resistance to rust and chemical erosion, the watch wears time The longer it is, the brighter it is. Therefore, some well-known international watch manufacturers have launched multiple series of ceramic watches, as shown in Figure 28. For example, Ruitu's Rado (radar) watch and Japan's Seiko Co., Ltd. (Rado, 2003) At present, the coloring of zirconia ceramics mainly includes the following methods. (1)Solid form mixing method Solid form mixing method is a method of synthesizing colored zirconia based on solid ignorance. That is, oxide particles such as colorants and mineralizers are mixed into stabilized zirconia powder according to a certain chemical ratio for mixing and ball milling. In this process, the solid particles are refined and the crystal lattice is distorted. The surface energy is increased. The reaction ability is enhanced, thereby increasing the chemical coloring reaction during the sintering process.Etho et al. (2004) used Y-TZI solid phase mixing and adding Co3O4, Cr2O3, TiO2, Al2O3, etc. to successfully prepare black oxide-bonded ceramic materials. However, the color stability is poor, the sintering temperature cannot be too high, and the colorant volatilizes. serious. If you add CoFe2O4 directly, you can also prepare black oxygen-junction ceramics, thus avoiding the use of heavy metal Cr (Briod, 1995). Using micron-grade ZrO2 as the raw material, the praseodymium zirconium yellow material as the coloring agent and a small amount of sintering aids, bright light yellow zirconia ceramics (Zhang Canying 2007) can be prepared, and ammonium metavanadate is used instead of the praseodymium zirconium yellow material as the coloring agent. More informations: email@example.com