Parameters of melting point, melting rate, and melting performance
Release time:
2023-05-26
Melting point and melting rate These are two important parameters describing the melting performance of a material:
1. Melting point: When a material absorbs heat and its temperature rises to a certain value, the temperature at which the solid transforms into a liquid is called the melting point of that material. It is an important temperature data in the material phase transition temperature, reflecting the ease of melting of the material.
Materials with high melting points have stronger chemical bonds between their atoms or ions, making them more difficult to melt, and vice versa. The melting point order of common metals is: W>Mo>Ta>Nb>Ni>Co>Fe>Cu>Al>Mg>Zn>Pb>Sn>Bi.
2. Melting rate: Under a certain degree of superheat, the amount of material melted per unit time is called its melting rate. It reflects the reactivity and ease of melting of the material under melting process conditions.
Melting point and melting rate are determined by many factors, mainly:
(1) Temperature. The higher the temperature, the more intense the molecular motion, the faster the melting reaction rate, and the greater the melting rate.
(2) Superheat. Superheat is the difference between the actual temperature and the melting point temperature, reflecting the amount of heat supplied. The greater the superheat, the faster the melting rate.
(3) Raw material properties. Elements in the same group in the periodic table have similar chemical properties and similar melting rates. The melting rate of metals is generally faster than that of non-metals.
(4) Fluidity of the melt. Melts with good fluidity have less interaction between molecules and fast melting rates; melts with poor fluidity have slow melting rates.
(5) Shape and volume of the melt. Melts with large surface area and small volume have fast phase transition reaction rates and large melting rates.
(6) Dynamic factors. Stirring, magnetic fields, etc. can improve the fluidity of the melt, accelerate the interaction between molecules, and increase the melting rate.
The melting point and melting rate have an important impact on the smelting, casting and processing of materials. The melting rate of the same material will vary greatly under different process conditions. In production management and process optimization, enterprises need to fully consider factors such as temperature, time, and stirring intensity, reasonably control and select them to achieve the ideal melting state of the material and ensure production efficiency and product quality.
Improve the company's production technology and management level; establish standardized operating procedures and quality management systems; select high-performance production equipment to achieve automated control. This requires enterprises to have certain technological innovation capabilities and financial strength to achieve and maintain a competitive advantage in the industry.
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