摘要:
Fine diameter continuous multifilament superconductor yarns comprising niobium carbonitride may be prepared. The fibers of which the yarn is composed possess a very high transition temperature (T.sub.c of 17.degree.K) combined with a good upper critical field (H.sub.c2 of 125 kG) and critical current density (J.sub.c of 10.sup.5 amps/cm.sup.2 at 40 kG). This invention provides excellent superconductor materials in the form of continuous fine diameter multifilament yarn.
摘要:
A process for strengthening carbide fibers by removing internal stresses caused by their formation. This process is accomplished by drawing the carbide fiber under tension through a furnace. The temperature of the furnace may range from about 2050.degree. to 2300.degree. C. while the fiber tensile stress may vary from about 200 to 3500 p.s.i. when using boron carbide fibers with diameters ranging from about 8 to 14 microns.
摘要:
A process for strengthening carbide fibers by removing internal stresses caused by their formation. This process is accomplished by drawing the carbide fiber under tension through a furnace. The temperature of the furnace may range from about 2050.degree. to 2300.degree.C while the fiber tensile stress may vary from about 200 to 3500 p.s.i. when using boron carbide fibers with diameters ranging from about 8 to 14 microns.
摘要:
A composite, contains substrate fibers, and carbon ion exchanger, on the substrate fibers. The fiber provides a support to the carbon ion exchanger, resulting in excellent mechanical properties, compared to carbon fiber ion exchangers.
摘要:
An electronic circuit having an electrically conductive pattern formed on a substrate and having on at least one surface of the substrate a film obtained from a soluble polymerizable oligomer of the formula: ##STR1## wherein D is ##STR2## wherein M is --C.tbd.C--, --C.tbd.C--C.tbd.C, --O--, ##STR3## wherein R is an alkyl or aromatic group; wherein Ar is an aromatic group; wherein x is an integer greater than two but less than 30, z is either zero or an integer, and y is an integer wtih the sum of y and z equal to x; and wherein n is an integer from 1 to 10. The substrate is coated by applying the above composition to the substrate and then hardening the composition by further polymerization. Preferred compositions contain the above described oligomer and certain plasticizers and/or toughening agents.
摘要:
A method for improving the durability, surface finish, and magnetic properties of a magnetic recording disk, the recording disk having a magnetic coating material with load bearing particles therein, by applying thereto a deformational force which exceeds the elastic limit of the coating material.
摘要:
A process for coating a substrate to provide good planarization and good mechanical and thermal stability, the process comprising applying to the substrate an amino-terminated oligomer and an ester, with the oligomer being formed from an aromatic diamine and from an aromatic dianhydride, and the ester being formed from an aromatic tetracarboxylic acid and an alcohol, and by reacting said oligomer and said ester in situ, with the process being characterized in that the ester reacts with an amine group of the oligomer to form a high molecular weight polyamide at a temperature between 40.degree. C. and 140.degree. C., and continues to react to form a cyclic imide.
摘要:
Organic prepolymer fillers capable of curing and reacting chemically with elastomers to form covalent bonds therewith are mixed with elastomers to form reinforcing domains with diameters of from 0.01 to about 50 microns, and when the mixture is cured, the mechanical strength of the elastomer is increased. In many cases, the thermal stability and/or the hydrolytic stability will also be increased.
摘要:
Boron nitride-boron nitride composite bodies may be produced by combining pure boron nitride fibers with partially nitrided fibers consisting essentially of B, N, O, and H, and hot pressing the composite at elevated temperatures and pressure. The partially nitrided material serves as a source of matrix material for the boron nitride fibers, and when fiber orientation is properly controlled, bodies of extremely high strength may be obtained. Densities in excess of 1.5 g./cc. may be obtained, in a one-step process which overcomes difficulties inherent in multiple-step nitriding and re-nitriding processes.
摘要:
A flame resistant cloth or fabric comprising synthetic fibers prepared from resin condensation products of phenols and aldehydes which can be fiberized and cured. These fabrics may include blends of phenolic resin fibers with other fire resistant fibers such as wool, silk, polyamide fibers, polyacrylonitrile fibers, mineral and glass fibers, among others.