Metallic fibers properties

Other fibrous and porous materials used for sound-absorbing treatments include wood, cellulose, and metal fibers foamed gypsum or Pordand cement combined with other materials and sintered metals. Wood fibers can be combined with binders and dame-retardent chemicals. Metal fibers and sintered metals can be manufactured with finely controlled physical properties. They usually are made for appHcations involving severe chemical or physical environments, although some sintered metal materials have found their way into architectural appHcations. Prior to concerns regarding its carcinogenic properties, asbestos fiber had been used extensively in spray-on acoustical treatments. 

It was previously mentioned was that a large number of minor copolymers of PET have been developed over the past 50 years, with the intent of modifying textile fiber properties and processability [2, 3], Of broader interest is that some of these textile modifications, such as PET copolymers with metal salts of 5-sulfoisophthalic acid (SIPA), have their own rich chemistries when the extent of polymer modification is increased beyond textile levels. An example of such a modification is that changing the counterions associated with SIPA can significantly effect the kinetics of polyester transesterification reactions (the... 

In addition to glass fibers, PBT can also be reinforced with carbon fibers. Many of the general trends seen with glass fibers are also observed with carbon fibers. One important aspect of carbon fibers is that they may bring electrical conductivity to PBT if sufficient fiber connectivity is achieved in the final part. Metal fibers and metal-coated carbon fibers have also been compounded with PBT, giving not only improved mechanical properties but also molded parts with enhanced ability to shield components from electromotive and radiofrequency interference (EMI-RFI) [33],... 

Attempts have been made to increase the strength of GICs by reinforcing them with metal fibers or flakes. Silver and gold powder have been mixed or fused with the glass powder part of the cement. Such approaches have resulted in improved wear resistance. The properties and clinical use of metal-reinforced glass-ionomer cements have recently been reviewed by Wasson (1993) and hence will not be repeated here [172]. 

Metal fibers exhibit a range of valuable properties e.g. electrical and thermal conductivity, high tensile strength, high elasticity modulus and high melting points (see Table 5.2-14). 

When the mesogen moiety is included into the main chain of the polymer, the obtained macromolecule contains inherently rigid units, which usually result in remarkable mechanical properties and thermal stability. Fibers made by these polymers compete with the best ceramic fibers and are far superior to metal fibers [83]. They therefore are ideal candidates as reinforcements for polymer-based composites. However, these materials often have a poor miscibility and adhesion to other polymeric substrates, limiting the range of their applications. This problem basically arises from weak intermolecular interactions either within the liquid-crystalline polymer itself or with the matrix of the composite. Strong ionic... 

Kevlar is a lyotropic liquid crystal which can be obtained from a sulfuric acid solution when the concentration reaches a critical value, e.g., 10%. However, this polymer like other LCPs is also anisotropic and its mechanical properties is directional, but less so in fibers than in the extruded plaques. The fiber properties in Table I are compared with other organic fibers and steel ( 15). On an equal weight basis, Kevlar has a strength several times that of steel. Perhaps, Kevlar is the first polymer at least comparable to metals. 

Reasons for use abrasion resistance, cost reduction, electric conductivity (metal fibers, carbon fibers, carbon black), EMI shielding (metal and carbon fibers), electric resistivity (mica), flame retarding properties (aluminum hydroxide, antimony trioxide, magnesium hydroxide), impact resistance improvement (small particle size calcium carbonate), improvement of radiation stability (zeolite), increase of density, increase of flexural modulus, impact strength, and stiffness (talc), nucleating agent for bubble formation, permeability (mica), smoke suppression (magnesium hydroxide), thermal stabilization (calcium carbonate), wear resistance (aluminum oxide, silica carbide, wollastonite)... 

Table 2,1 Properties of synthetic and natural-inorganic or organic and metallic fibers... 

Other fibers may be used in POs, though some of these may be chosen more for their special properties. Basalt mineral fibers or Kevlar can provide extreme reinforcement for ballistics applications other fibers include metal fibers for electromagnetic shielding purposes (discussed in Chapter 6). However, as in the case of stainless steel fibers, just because an additive is in fiber form does not necessarily mean it provides meaningful mechanical property reinforcement, but it may provide the opposite of what is wanted [6-4, 7-57]. 

Mineral, organic and metallic fibers, and the surfaced materials made from them such as fleece mats, textiles, and weaves, not only make possible economical manufacturing of materials with specifically targeted physical property improvements based on standard plastics and technical molding compounds, but also help manage high mechanical stress loads, which are often direction-dependent and show local variations, with anisotropic composite structures. 

Uses Metal/fiber wetting agent demulsifier stabilizer for chlorinated systems for drawing, stamping, rolling lubricants wastewater stripping oils leather treatment textile spin finishes rust preventive compds. Features Patented forms continuous monomolecular film with rust prevention props. environmentally friendly Properties Gardner 10 max. color vise. 100-140 SUS (100 F) acid no. 6-10 iodine no. 100-130 sapon. no. 170-180 hyd. no. 21-35 pour pt. -6 to 6 F cloud pt. 40 F max. flash pt. (COC) 450 F min. 

---