Product Name: Hafnium Disilicide (HfSi2) 
Specification: 0.8-10um (D50) 
Appearance: Irregular 
Color: Black Grey 
Features: high purity, small particle size, uniform distribution, large specific surface area, and high surface activity 
Application: Metal ceramics, high-temperature anti-oxidation coatings, high-temperature structural materials, and aerospace and other fields

English name: Hafnium silica 
CAS:12401-56-8 
EINECS:235-640-1 
MDL Number: MFCD00167026 
Density (g/mL, 25 ℃): 8.02 
Melting point (º C): 1680 
Density: 8.02 
Molecular formula: H8HfSi2 
Molecular weight: 242.72500 
Accurate quality: 243.96300 
Single isotope mass: 243.962952 Da 
Nominal quality: 244Da 
Average quality: 242.7245Da 
Performance characteristics: 
Hafnium silicide is a transition metal silicide and a refractory intermetallic compound. Due to its unique physical and chemical properties, it is applied in thin film coatings, block structures, electric heating elements, thermoelectric materials, and photovoltaic materials. In addition, hafnium silicide nanomaterials have special electrical and optical properties, including magneto electric and thermoelectric properties, which have potential applications in the field of catalysis. Hafnium silicide products have the characteristics of high purity, small particle size, uniform distribution, large specific surface area, and high surface activity. Hafnium silicide is most commonly used in ceramic materials for manufacturing various high-temperature and functional components. 
Application of hafnium silicide in material preparation: 
1. Preparation of Silicon Carbide Hafnium Silicide Tantalum Silicide (SiC-HfSi2-TaSi2) Anti ablation Composite Coating Carbon Fiber Reinforced Carbon (C/C) Composite Material is a new type of high-temperature composite material with carbon fiber as the reinforcement and pyrolytic carbon as the matrix. Due to its excellent high-temperature strength, anti ablation performance, and good friction and wear performance, the United States conducted research on C/C composite materials for thermal structures in the early 1970s, which led to the development of C/C composite materials from heat-resistant materials to thermal structural materials. C/C composite materials, as thermal structural materials, can be used for structural components of gas turbine engines, nose cone caps of space shuttles, wing leading edges, etc. Most of these components work in high-temperature and oxidizing environments. However, C/C composite materials are prone to oxidation and typically cannot serve normally in oxidizing atmospheres above 400 ℃. This requires appropriate antioxidant protection for C/C composite materials, and preparing antioxidant coatings is one of the main protective measures. Research has shown that when refractory metals such as Zr, Hf, Ta, TiB2 are added to the carbon matrix, the anti ablation performance of C/C composites can be further improved. In order to understand the influence of metal Hf and Ta on the ablation performance of C/C composite materials, SiC-HfSi2-TaSi2 anti ablation coating was prepared by embedding method in experiments, and the ablation performance of the anti ablation coating was measured using an oxyacetylene ablation device. junction 
2. Prepare an organic electroluminescent device. Comprising sequentially stacked anodes, luminescent layers, cathodes, and encapsulation covers, wherein the encapsulation cover encapsulates the luminescent layer and cathode onto the anode, and the encapsulation cover comprises a silicon carbide nitride layer and a barrier layer formed on the surface of the silicon carbide nitride layer; The material of the barrier layer includes silicide and metal oxide, wherein the silicide is selected from at least one of chromium silicide, tantalum disilicide, hafnium silicide, titanium disilicide, molybdenum disilicide, and tungsten disilicide, and the metal oxide is selected from at least one of magnesium oxide, aluminum oxide, titanium dioxide, zirconium oxide, hafnium dioxide, and tantalum pentoxide. The above-mentioned organic electroluminescent devices have a longer lifespan. The present invention also provides a method for preparing an organic electroluminescent device. 
3. Prepare a silicon germanium alloy based thermoelectric element. The silicon germanium alloy based thermoelectric element consists of an electrode layer, a silicon germanium alloy based thermoelectric layer, and a barrier layer located between the electrode layer and the silicon germanium alloy based thermoelectric layer. The barrier layer is a mixture of silicide and silicon nitride, and the silicide is at least one of molybdenum silicide, tungsten silicide, cobalt silicide, nickel silicide, niobium silicide, zirconium silicide, tantalum silicide, and hafnium silicide. The silicon germanium alloy based thermoelectric element provided has good interface bonding, with no cracks or obvious diffusion phenomena at the interface. The contact resistance is small, the thermal contact state is good, and it can withstand long-term high-temperature acceleration tests. The preparation method provided also has the characteristics of simple process, high reliability, low cost, no need for special equipment, and suitability for large-scale production. 
4. Prepare a high-temperature and anti-oxidation metal ceramic composite coating. The composite film is characterized by a coating composed of refractory metals, refractory carbides, and intermetallic compounds, with a coating thickness ranging from 10 μ m to 50 μ m. The refractory metal is one or more of molybdenum, tantalum, zirconium, and hafnium; The composition of the refractory carbide is silicon carbide, as well as one or more of tantalum carbide, zirconium carbide, and hafnium carbide; The composition of the intermetallic compound is one or more of molybdenum silicide, tantalum silicide, zirconium silicide, hafnium silicide, tantalum carbon silicide, zirconium carbon silicide, and hafnium carbon silicide; The crystal structure of the coating is composed of amorphous and/or polycrystalline nanoparticles. 
Storage method: 
This product should be sealed and stored in a dry and cool environment, and should not be exposed to air for a long time to prevent moisture from causing aggregation, affecting dispersion performance and use effectiveness. In addition, it should be avoided from heavy pressure, and should not come into contact with oxidants. It should be transported as ordinary goods.