The spunbond process is considered the fastest manufacturing method for nonwoven fabrics. As a result, spunbonding is considered to be more economical than other manufacturing methods such as needle punching staple fiber. During the spunbonding process extruded filaments are spun onto a collecting belt and bonded by applying heated rolls .
1. It reinforce old asphalt concrete road surface and asphalt layer, and prevents damage ;
2. It is used for rebuilding cement concrete road surface into composite road surface and restraining reflection caused by block contraction .
3. It is used in road expansion and improvment project and crack caused by old and new combination position and uneven sedimentation ;
4. It is used in soft soil base reinforcement treatment , is favorable for soft soil water separation and concretion,restrains sedimentation effectivly,distributes stress uniformly and improve overall strength of road base;
5. It is sued for preventing contraction crack caused by new road semi-rigid base layer,and reinforces and prevents road surface crack caused by foundation crack reflection.
Pet Spunbond Nonwoven Fabric, Spunbond Nonwoven Geotextile Fabric, Spunbond Anti-static Pet Nonwoven Fabric Feicheng Lianyi Engineering Plastics Co., Ltd , https://www.lianyigeosynthetics.com
High-entropy alloys are materials made up of five or more metals in nearly equal amounts. High-entropy alloys are widely used in materials science and engineering. The research team successfully combined lithium, magnesium, titanium, aluminum and bismuth to prepare nano-crystallite high-entropy alloy, which has the advantages of low density and high strength.
Professor Carl Koch of North Carolina State University said: This nano-crystallite high-entropy alloy has the same density as aluminum, but its strength is higher than that of titanium. It has the characteristics of low density and high strength, which is unmatched by other metal materials. Its weight-to-weight ratio is comparable to that of some ceramics, but it is harder than brittle ceramics.
There is still a lot of work to be done on the preparation of this new type of nanocrystalline high entropy alloy, one of which is the cost of 20% of expensive tantalum raw materials. Since some materials (lithium and magnesium) require a higher vapor pressure, the experiment uses a mechanical alloying method instead of the melting and casting method, and finally can produce up to 99% of the metal powder of the village committee.
The alloy powder prepared by the mechanical alloying method has less nitrogen and oxygen impurities and has a single-phase face-centered cubic lattice structure characteristic. The particle size of the nanocrystallite can be calculated by the Scherrer formula to be about 12 nm.
New low density high strength powder alloy
Abstract Two research teams from North Carolina State University and Qatar University have recently developed a high-entropy metal alloy with a higher weight-to-weight ratio than the existing metal materials. A high-entropy alloy is a material composed of five or more metals in nearly equal amounts...
Two research teams from North Carolina State University and the University of Qatar have recently developed a high-entropy metal alloy with a higher weight-to-weight ratio than the existing metal materials.