粉末冶金宝典(国外英文资料).docVIP

粉末冶金宝典(国外英文资料) DOC documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. Basic knowledge of powder metallurgy (1) the chemical composition of the powder and the assembly of discrete particles of size less than 1mm are usually called powders, and the units of measurement are generally microns (m) or nm. 1., the chemical composition of powder, commonly used metal powder, iron, aluminum and other alloy powder, copper, and its impurities and gas content of not more than 1% ~ 2%, otherwise it will affect the quality of the product. 2. the physical properties of the powder particle size and particle size distribution of the powder can be separated and the minimum entity independent existence to single particles. The actual powder is often agglomerated particles, i.e., two particles. The percentage of different sizes in the actual powder particles is the particle size distribution. The particle shape is the appearance of powder particle geometry. Common are spherical, columnar, needle like, plate-like and flaky, and can be determined by microscopic observation. The specific surface area of the total surface area per unit mass of powder, through the actual measurement. Surface area, surface adsorption and aggregation are affected by specific surface area. 3. the technological properties of powder include the flowability, filling characteristics, compressibility and formability of the powder. The filling characteristics without any external conditions, the tightness of the powder packing. Often Yisong loading density and bulk density representation. The filling characteristics of powders are related to the size, shape and surface properties of powders. The liquidity refers to the ability of powder flow, commonly used 50 grams of powder from the standard funnel outflow time required for said. Flowability is affected by particle adhesion. The compression of the powder is pressed by th