Tungsten zirconium oxide ; Ditungsten zirconium octaoxide
CAS no. : 16853-74-0
EINECS no. : 240-876-3
Molecular formula: Zr(WO4)2
Molecular weight: 586.8992.
Appearance: Bright green powder
Composition content (%)The test results
Zr (WO4) 2: 99.5 or higher
Mo: 0.02 or less
Cu: 0.0002 or less
Fe: 0.001 or less
Si: 0.004 or less
Pb: 0.001 or less
Na: 0.0001 or less
Cl: 0.0001 or less
Zirconium tungstate is a negative thermal expansion material with excellent performance. It has negative thermal expansion performance in the temperature range of 0.3-1050.0K. ZrW2O8 is a material with a large isotropic negative thermal expansion coefficient over a large temperature range. , is a structural, functional material with great application potential. As a negative expansion material, it is usually used to prepare a composite material with a controllable thermal expansion coefficient. ZrW2O8 mainly uses negative expansion material and photolysis water material. The thermal expansion coefficient is -4.9×10-6K-1 (430-950K, high temperature phase). At room temperature, zirconium tungstate is a cubic crystal, including a low-temperature phase and a high-temperature phase, and undergoes a transition at a temperature of about 430K.
Used in engineering ceramics, electronic ceramics, metal matrix composites, ceramic matrix composites, cement matrix composites, optical devices, dental materials and other raw materials.
The preparation methods
Immersion method, coprecipitation method, hydrothermal method, sol gel method, hydrothermal method, combustion method.
The solid phase products have impurities and need to be quenched, and the co-precipitation method also needs to be quenched, and the combustion method pollutes the environment, and the coprecipitation method and hydrothermal method are widely used.
Secondary tungstate, zirconium oxychloride and so on.
Tungsten zirconate is difficult to synthesize, high cost and poor performance in high temperature. It is usually selected to add some substances to inhibit its decomposition, but the addition of materials remains to be analyzed.
The storage method
The room temperature is close to the light, ventilated and dry.
The development direction
The thermodynamic stability temperature range of tungsten zirconate is narrow, only between 1105-1257, the material synthesis is difficult, how to improve the product purity, and reduce the production cost is the main development direction of zirconate in the future.
Other name: tantalum boride (1:2)
CAS no. : 12007-35-1
EINECS no. : 234-234-5
Molecular formula: B2Ta.
Molecular weight: 202.572
Molecular formula: ZrV2O7.
Molecular weight: 315.7.
CAS no. : 13981-20-9
Appearance: yellow powder
Used in functional ceramics, structural ceramics and other aspects as pigments.
- The use of temperature: 400-1080 ℃
- The coefficient of linear expansion: – 10 x 10-6 ℃ – 1
Ammonium niobium oxalate
English alias: Ethanedioic acid ammonium niobium (5 +) salt , Ammonium niobate (v) oxalate hydrate
CAS no. : 168547-43-1
Molecular formula: C4H4NNbO9
Molecular weight: 302.98 g / mol
Other name: Tantalic Chloride, Tantalum(V) chloride, Tantalumchlorideanhydrous
CAS no. : 7721-01-9
EINECS no. : 231-755-6
Molecular formula: Cl5Ta
Molecular weight: 358.2145
Melting point: 221-235 ℃
Relative density :3.682
English alias: Molybdenum (V) chloride; Molybdenumchlorideanhydrous; Molybdenum (V) chloride; molybdenum (5+) pentachloride
CAS number: 10241-05-1
EINECS number: 233-575-3
Molecular formula: Cl5Mo
Molecular weight: 273.205
Melting point: 194 ° C
Other name : niobiumbago (NBB); boranylidyneniobium
CAS no. : 12653-77-9; 12045-19-1
EINECS no. : 234-958-8
Molecular weight: 103.7174.
Melting point: 3050℃
CAS no. : 12039-79-1
EINECS no. : 234-902-2
Molecular formula: H6Si2Ta.
Molecular weight: 243.16654
Other name: Tungsten disilicide
CAS no. : 12039-88-2
EINECS no. : 234-909-0
Molecular weight: 240.011
Density: 9.40 g/cm3
Melting point: 2165 C.
Chemical name: black titanium, titanium black, black titanium powder, titanium oxide,
English name: Tilox Black (South Korea); titanium black;
Magneli phase; Sub-oxidation Ti2O
Pigment Properties: Blue Black Powder
Chemical composition: Ti4O7
English alias: Tantalum mononitride; nitridotantalum; nitrogen (-3) anion; tantalum (+5) cation
CAS number: 12033-62-4
EINECS No. 234-788-4
Molecular formula: N5Ta3
Molecular weight: 194.95