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Specialized in R&D and production of aerosolized alloy powder materials

Brazing common sense

Powder common sense

Application essential knowledge

Element Essential Knowledge

Material Essential Knowledge

Brazing Temperature

Generally, the melting point of the brazing material is heated to a higher temperature depending on the characteristics of the brazing material used. For different brazing materials and materials to be welded, it is necessary to determine the appropriate brazing temperature according to its characteristics. The main parameter of brazing process is brazing temperature and holding time. The brazing temperature is usually selected to be 25-60 ℃ higher than the liquidus temperature of the filler metal assuring the filler metal is able to fill in the gap.

Liquidus Phase Line

Generally it refers to the temperature of molten steel at the intersection of solid and liquid.

Solidus

Phase is a physical term. The organizations with the same composition and structure are collectively referred to as phases. Binary phase diagram, also known as binary phase diagram, is a simple diagram that shows the relationship between components, temperature and pressure of two components in a system in thermodynamic equilibrium state. The solid phase line is all solid, and the solid phase is a phase composed of solids. The common calculation formula for equilibrium solid-phase line is based on Fe-C equilibrium phase diagram (iron-carbon equilibrium diagram). The solid phase line in non-flat solidified state is usually calculated by model heat tracing.

Solid-Liquid Phase

It means the phase transition boundary between a solid and a liquid when they coexist at a certain temperature. When a substance is at a phase transition point, it carries on the properties of either a solid or a liquid. The intermediate liquid state occurs at this critical point.

D50

The particle size corresponding to a powder sample whose cumulative particle size distribution percentage reaches 50%. Physically it means particles larger than 50% of its account, particles smaller than 50% of its account, D50 is also called the median diameter or median particle size.

Specific Surface Area

Specific surface area refers to the total area of the material per unit mass. The unit is m2/g. It usually refers to the specific surface area of a solid material, such as powder, fiber, particle, flake, block and other materials. There is another definition of specific surface area: area/volume. Generally, the finer the powder is, the more irregular the particle shapes, the coarser the particle surface is, the more complex the particle structure is, and the larger the surface ratio is. The larger the powder ratio surface is, the greater the friction between particles is. The powder ratio surface has a great influence on the powder properties such as loose packing density, vibratory density, fluidity, compressibility and formability. Under normal circumstances, the larger the powder than the surface, the smaller the loose density, the worse the fluidity, the more the powder density increases after shaking, and the compressibility decreases, the formability improves. Controlling the specific surface of the powder will improve the stability of the process performance. Since most reactions are carried out on the particle surface, the measurement of the surface is also quite important for controlling the sintering process.

Carney Flow Rate

The flowability of metal powders measured by the Carney funnel method can also be used to compare several powders when some powders flow through the Hall funnel and others do not. Humidity and moisture content affect flow rates, and wet powder may not flow through the Hall funnel or Carney funnel.

Hall Flow Rate

It refers to the time required for a certain amount of powder to flow through a standard funnel with a specified aperture (Hall velocity meter), usually used as a unit of s/50g, the smaller the value indicates the better powder fluidity, which is a process performance of the powder.

Powder Flowability

It refers to the time required for a certain amount of powder to flow through a standard funnel with a specified aperture, usually used as a unit of s/50g, the smaller the value indicates the better powder fluidity, which is a process performance of the powder.

Tapping Density

It is the mass per unit volume measured by the powder in the container after vibration under specified conditions, usually expressed in g/cm³;

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