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6677 results about "Low melting point" patented technology

A low melting point means it's more likely that at the current temperature that the substance is a liquid. So, something like #Br_2(l)# has a low melting point (#-7.2^oC#). A low melting point also means that the inter-molecular forces that cause attractions between one molecule and another are not very strong.

Bulletproof lightweight metal matrix macrocomposites with controlled structure and manufacture the same

The lightweight bulletproof metal matrix macrocomposites (MMMC) contain (a) 10-99 vol. % of permeable skeleton structure of titanium, titanium aluminide, Ti-based alloys, and / or mixtures thereof infiltrated with low-melting metal selected from Al, Mg, or their alloys, and (b) 1-90 vol. % of ceramic and / or metal inserts positioned within said skeleton, whereby a normal projection area of each of said inserts is equal to or larger than the cross-section area of a bullet or a projectile body. The MMMC are manufactured as flat or solid-shaped, double-layer, or multi-layer articles containing the same inserts or different inserts in each layer, whereby insert projections of each layer cover spaces between inserts of the underlying layer. The infiltrated metal contains 1-70 wt. % of Al and Mg in the balance, optionally, alloyed with Ti, Si, Zr, Nb, V, as well as with 0-3 wt. % of TiB2, SiC, or Si3N4 sub-micron powders, to promote infiltrating and wetting by Al-containing alloys. The manufacture includes (a) forming the permeable metal powder and inserts into the skeleton-structured preform by positioning inserts in the powder followed by loose sintering in vacuum to provide the average porosity of 20-70%, (b) heating and infiltrating the porous preform with molten infiltrating metal for 10-40 min at 450-750° C., (c) hot isostatic pressing of the infiltrated composite, and (d) re-sintering or diffusion annealing.
Owner:ADVANCED MATERIALS PRODS

Large-capacity nickel-metal hydride battery

The invention discloses a large-capacity nickel-metal hydride battery, comprising a pole plate group, wherein a diaphragm is arranged between the adjacent positive plate and negative plate, three pole ears with C-like distribution are arranged on the pole plates, and the positive plate and the negative plate are oppositely arranged at intervals; one side of the pole plate group is coated with a positive current collector, the outer side of the positive current collector is coated with a positive flow deflector, the positive flow deflector is connected with the positive current collector through a low-melting-point welding layer, a positive pole rod is arranged on the positive flow deflector, the outer side of the positive flow deflector is coated with a positive guard plate, and a positive cooling system is arranged between the positive guard plate and the positive flow deflector; and the negative side structure is the same as the positive side structure. The pole plate adopts the pole ears with C-like distribution, the positive and negative current collectors are connected with the corresponding pole ears, the flow deflector and the current collector are welded together through a low-melting-point silver alloy, the resistivity of a conductor can be reduced, and thus the charge and discharge rate can be increased to a maximum extent; and the positive cooling system and the negative cooling system can cool the temperature rise generated by high-rate charging and discharging of the batteries.
Owner:山东三尺企业管理咨询有限公司

Optical recording medium and method for recording optical information

The present invention provides an optical recording medium which incorporates an inorganic based recording layer which has a high reflectance, sufficient for reproduction compatibility on devices such as CD-ROM drives, as well as a high degree of modulation between the state prior to recording and that after recording, as well as an information recording method therefor. Accordingly, an optical recording medium comprises a substrate (2) which is substantially transparent with respect to a recording light beam and a reproduction light beam, a first recording layer (3) which is layered on top of the substrate (2) and which incorporates as the main constituent a metal which has a low melting point and a high reflectance, and a second recording layer (4) which is layered on top of the first recording layer (3) and which will, due to heat generated from irradiation of a light beam through the substrate (2), either mix, or alternatively react, with the first recording layer (3) to form an alloy of low reflectance as well as forming irregularities or pitting in the surface, thereby enabling the recording of information. Due to the heat generated from irradiation of a recording light beam through the substrate (2) the first recording layer (3) and the second recording layer (4) are either mixed, or alternatively reacted to form an alloy as well as forming irregularities or pitting in the surface, thereby recording information.
Owner:KAO CORP

Electrostatic spinning nanofiber membrane as well as preparation method thereof

The invention provides an electrostatic spinning nanofiber membrane as well as a preparation method thereof. The electrostatic spinning nanofiber membrane provided by the invention comprises a fiber membrane obtained by electrostatically spinning a high-melting-point polymer and a fiber membrane obtained by electrostatically spinning a low-melting-point polymer, wherein the difference on the melting points of the high-melting-point polymer and the low-melting-point polymer is not less than 10 DEG C. The electrostatic spinning nanofiber membrane provided by the invention is multipurpose and can be applied to the fields such as biomedicines, energy and chemical industry, gas and liquid filtration, waterproofness and windproofness, windproofness and heat insulation, moisture permeability and ventilation, environmental management and semiconductor sensors. According to the electrostatic spinning nanofiber membrane provided by the invention, electrostatic spinning is respectively carried out on the high-melting-point polymer and the low-melting-point polymer, and the high-melting-point polymer fiber membrane and the low-melting-point polymer fiber membrane obtained are composited and hot-pressed to obtain the electrostatic spinning nanofiber membrane. The preparation method provided by the invention is high in production efficiency and low in energy consumption, and is suitable for industrial production.
Owner:ZHEJIANG WEIXING IND DEV

Grain boundary phase-reconstructed high-corrosion resistance Sintered NdFeB magnet and preparation method thereof

The invention discloses a sintered Nd-Fe-B magnet with high corrosion resistance and the grain boundary reconstruction and a preparation method thereof. The composition of the invention is that: NdeFe100-e-f-gBfMg, wherein, e is greater than or equal to 6 and equal to or less than 24, f is greater than or equal to 5. 6 and equal to or less than 7, g is greater than or equal to 0.03 and equal to or less than 8, M is one or some of elements Dy, Tb, Pr, Sm, Yb, La, Co, Ni, Cr, Nb, Ta, Zr, Si, Ti, Mo, W, V, Ca, Mg, Cu, Al, Zn, Ga, Bi, Sn and In; The method is that: main phrase alloy and reconstructed grain boundary phase alloy are respectively pulverized and mixed uniformly; the powder mixture is pressed to a mould in the magnetic field, and fabricated into a sintering magnet in a high vacuum sintering furnace. By the reconstruction of the grain boundary phase composition, the invention can obtain the grain boundary phase alloy with low melting point and high electrode potential, decrease the potential difference between the main phase and the grain boundary phase on the basis of ensuring the magnetic properties, promote the intrinsic corrosion resistance of magnet, and has the advantages of simple process, low cost and being suitable for the batch production. Therefore, by combining the grain boundary reconstruction and double alloy method, the sintered Nd-Fe-B magnet with high intrinsic corrosion resistance can be prepared.
Owner:ZHEJIANG UNIV

Polypropylene composition useful for making solid state oriented film

Disclosed is a polypropylene composition useful for making solid state oriented film. The composition comprises two predominantly isotactic polypropylenes with the melting point temperature of one of the polypropylenes being substantially lower than the melting point temperature of the other. In one embodiment of the composition the higher melting point polypropylene is made by Ziegler-Natta catalysis, while the lower melting point polypropylene is made by metallocene catalysis. Compared to polypropylene with similar melt flow rate and made by Ziegler-Natta catalysis, and solid state oriented film thereof, the composition provides a better balance of elevated temperature draw characteristics and physical properties of oriented film made therefrom. Thus, at the same or lower elevated temperature yield stress, oriented film of the composition exhibits improved properties such as stiffness, elongation-at-break, dimensional stability, and oxygen barrier. Also disclosed is a method for the manufacture of oriented, flexible packaging film. In the method a cast sheet is melt extruded from the composition, and, after cooling until it is solid, the cast sheet is stretched to the desired extent of orientation at a temperature which the sheet does not break while being stretched, but below the Tm of the composition. The resulting film then is cooled to at least the crystallization temperature of the lower melting point polypropylene.
Owner:MONTELL TECH CO BV
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