Molecular Formula | CrSi2 |
Molar Mass | 108.17 |
Density | 4,7 g/cm3 |
Melting Point | 1490°C |
Water Solubility | Insoluble in water. |
Appearance | Powder |
Color | Gray |
Storage Condition | Room Temprature |
Sensitive | Moisture Sensitive |
MDL | MFCD00168070 |
Hazard Symbols | Xn - Harmful |
Risk Codes | R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. R42/43 - May cause sensitization by inhalation and skin contact. |
Safety Description | S7 - Keep container tightly closed. S36 - Wear suitable protective clothing. |
WGK Germany | 3 |
TSCA | Yes |
crystal structure | Hexagonal | |
EPA chemical information | Information provided by: ofmpub.epa.gov (external link) | |
Overview | Chromium silicide is a gray tetragonal prismatic crystal, insoluble in water, sulfuric acid and nitric acid, soluble in hydrochloric acid and hydrofluoric acid. At room temperature, it is stable in the air. At 100 ℃, the surface is oxidized. At 400 ℃, it reacts violently with chlorine to form chromium trichloride and silicon tetrachloride. Preparation method: at 1200 ℃, it is obtained by the reaction of chromium with silicon tetrachloride, or the reaction of silicon with an appropriate amount of chromium in an electric furnace. | |
application | CN200710035836.5 discloses a composite heating element of molybdenum disilicide silicon aluminum oxygen nitrogen polymer material. the raw material of the composite heating element is mainly molybdenum disilicide powder, silicon aluminum oxygen nitrogen polymer material (sialon) powder is added as a fortifier, and chromium disilicide powder is added as an activator. it is characterized in that the content of silicon aluminum oxygen nitrogen polymer material in the whole heating element is 1%-30wt%, the total weight of silicon aluminum oxygen nitrogen polymer material and chromium disilicide accounts for 5%-40wt% of the weight of the heating element. It is liquefied by chromium disilicide at 1600 ℃ to reduce the sintering temperature of the heating body to increase the sintering density, the grain of the heating body is refined by the addition of sialon, and the bending strength and fracture toughness of the heating body are improved by the sialon strengthening phase. And Vickers hardness. Under high temperature aerobic conditions, a SiO2 oxide film is formed on the surface of the product to enhance its oxidation resistance. The invention provides a solution to solve the problem that the MoSi2 heating body is too low in strength and toughness, which is easy to break during processing, transportation, installation and use, resulting in a short life. CN201610703247.9 provides a preparation method of carbon/carbon composite material SiCn-CrSi2 coating: chromium silicide powder and nano silicon carbide powder are prepared into a suspension with 1200~1500mL of water, and the suspension is ultrasonically shaken and stirred until it is dispersed uniformly; The sample is placed in the heating coil of the electromagnetic induction heater, and then the suspension flows through the sample and circulates; The heating coil is used for electromagnetic induction heating, the heating time is controlled at 5~30min, and the current intensity is controlled at 350 ~ 500A; The sample is naturally cooled to room temperature and dried. The invention adopts an electromagnetic induction heating method to prepare a SiCn-CrSi2 composite outer coating in a dynamic scouring state. The prepared coating has uniform thickness, no cracks on the surface, high bonding strength, short preparation period, convenient operation, and easy availability of raw materials. Low cost and other advantages. |