magnesium oxide whisker：magnesia whisker - Names and Identifiers
magnesium oxide whisker：magnesia whisker - Physico-chemical Properties
| Molecular Formula | MgO
|
| Physical and Chemical Properties | A very fine fibrous single crystal. The relative density is 3.58, and the apparent density is 0.1g/cm3. Melting point 2800 ℃. It has good heat resistance, insulation, thermal conductivity, alkali resistance, stability and reinforcement characteristics. The thermal conductivity is three times that of alumina. Heat resistance temperature 1600 ℃, tensile strength 980MPa, thermal expansion rate 13.5 × 10-6K, thermal conductivity 260w/(m?K). The resistance value is 1017 at normal temperature? Above Ω cm. |
magnesium oxide whisker：magnesia whisker - Introduction
Magnesium oxide whiskers are fibrous structures composed of nano-sized magnesium oxide particles. It has the following properties:
1. High temperature stability: Magnesium oxide whiskers can maintain structural stability in high temperature environments, and can usually withstand temperatures exceeding 1000 degrees Celsius.
2. High strength and stiffness: Magnesium oxide whiskers have high mechanical strength and stiffness, and can be used as reinforcing materials to improve the performance of composite materials.
3. Low thermal conductivity: Magnesium oxide whiskers have low thermal conductivity, so they can be used as insulating materials.
4. Chemical inertness: Magnesium oxide whiskers have high chemical stability to most chemicals.
Magnesium oxide whiskers have a wide range of applications in many fields:
1. Reinforcing material: Magnesium oxide whiskers can be used as a reinforcing agent to add to the metal matrix to improve the strength and rigidity of the alloy.
2. Insulation material: Due to its low thermal conductivity and high temperature resistance, magnesium oxide whiskers can be used for the preparation of high temperature insulation materials.
3. Friction materials: Magnesium oxide whiskers have high friction coefficient and wear resistance, and can be used to manufacture friction materials, such as brake pads and friction plates.
4. catalyst: magnesium oxide whisker can be used as the carrier of the catalyst and play a catalytic role in the chemical reaction.
The methods of preparing magnesium oxide whiskers include sol-gel method, thermal decomposition method, hydrothermal method, etc., of which sol-gel method is one of the most commonly used preparation methods.
When using and handling magnesium oxide whiskers, the following safety information should be paid attention:
1. Avoid inhalation: Magnesium oxide whiskers have the characteristics of nano-scale particles, which may produce dust suspended in the air. Inhalation should be avoided to avoid damage to the respiratory system.
2. Avoid contact: Direct contact with magnesium oxide whiskers may cause irritation and damage to the skin and eyes, so you should wear appropriate personal protective equipment during operation, such as laboratory gloves, goggles, etc.
3. storage and handling: magnesium oxide whiskers should be stored in a dry place, away from fire and flammable materials. Waste shall be properly disposed of according to local regulations to avoid environmental pollution.
Last Update：2024-04-09 21:04:16