118 results about "Full density" patented technology

A flash memory has multi-level cells (MLC) that can each store multiple bits per cell. Blocks of cells can be downgraded to fewer bits/cell when errors occur, or for storing critical data such as boot code. The bits from a single MLC are partitioned among multiple pages to improve error correctability using Error Correction Code (ECC). An upper reference voltage is generated by a voltage reference generator in response to calibration registers that can be programmed to alter the upper reference voltage. A series of decreasing references are generated from the upper reference voltage and are compared to a bit-line voltage. Compare results are translated by translation logic that generates read data and over- and under-programming signals. Downgraded cells use the same truth table but generate fewer read data bits. Noise margins are asymmetrically improved by using the same sub-states for reading downgraded and full-density MLC cells.

Embodiments of the present invention relate to methods of forming powder metals materials and parts. More specifically, certain embodiments of the present invention relate to methods of forming powder metals materials and parts by densifying at least a portion of a surface of the materials and/or parts after sintering and prior to densifying one or more core regions of the materials and/or parts. Other embodiment provide powder metal parts, such as gears and sprockets, having surface regions that are uniformly densified to full density to depth ranging from 0.001 inches to 0.040 inches, and core regions that can have at least 92 percent theoretical density and further can have essentially full density, or full density. Still other embodiments relate to brazed, welded, plated and gas-tight powder metal parts and components that can be made in accordance with the various non-limiting methods disclosed herein.

Methods for preparing carbon nanotube layers are disclosed herein. Carbon nanotube layers may be films, ribbons, and sheets. The methods comprise preparing an aligned carbon nanotube array and compressing the array with a roller to create a carbon nanotube layer. Another method disclosed herein comprises preparing a carbon nanotube layer from an aligned carbon nanotube array grown on a grouping of lines of metallic catalyst. A composite material comprising at least one carbon nanotube layer and prepared by the process comprising a) compressing an aligned single-wall carbon nanotube array with a roller, and b) transferring the carbon nanotube layer to a polymer is also disclosed.

The present invention provides an unmanned aerial vehicle real-time map reconstruction method. By applying an unmanned aerial vehicle, the three-dimensional maps of the surrounding environment of the unmanned aerial vehicle are obtained, and the own positioning of the unmanned aerial vehicle is realized. According to the method, the unmanned aerial vehicle flies in the unknown airspace, and on the condition that the own position of the unmanned aerial vehicle is not clear, the own positioning of the unmanned aerial vehicle is obtained and the three-dimensional maps are constructed by detecting and comparing the environmental information, and extracting and matching the feature information of the environment. The unmanned aerial vehicle real-time map reconstruction method also comprises the geographic information fusion and an image mosaic technology. The unmanned aerial vehicle real-time map reconstruction method of the present invention can be applied to the fields, such as the battlefield demands, for example the unmanned aerial vehicle autonomous flight and attack, the disaster emergency rescue, such as fire hazard, earthquake, flood, etc., the unmanned aerial vehicle security administration and monitoring, etc. Compared with the conventional method, and according to the present invention, a position drifting amount, an angle drifting amount or an absolute error is above the average, and more environmental information is obtained. Moreover, compared with a full-density method, an experimental precision of the method still can reach a usage standard, and the method can be operated on a CPU directly and is good in real-time performance.

The invention is suitable for the manufacture of flat or shaped titanium matrix composite articles having improved mechanical properties such as lightweight plates and sheets for aircraft and automotive applications, heat-sinking lightweight electronic substrates, bulletproof structures for vests, partition walls and doors, as well as for sporting goods such as helmets, golf clubs, sole plates, crown plates, etc. A fully-dense discontinuously-reinforced titanium matrix composite (TMMC) material comprises (a) a matrix of titanium or titanium alloy as a major component, (b) ceramic and/or intermetallic hard particles dispersed in the matrix in the amount of ≦50 vol. %, and (c) complex carbide- and/or silicide particles at least partially soluble in the matrix at the sintering or forging temperatures such as Ti₄Cr₃C₆, Ti₃SiC₂, Cr₃C₂, Ti₃AlC₂, Ti₂AlC, Al₄C₃, Al₄SiC₄, Al₄Si₂C₅, Al₈SiC₇, V₂C, (Ti,V)C, VCr₂C₂, and V₂Cr₄C₃ dispersed in the matrix in the amount of ≦20 vol. %. The method for manufacturing TMCC is comprised of the following steps: (a) preparing a basic powdered blend containing matrix alloy or titanium powders, dispersing ceramic and/or intermetallic powders, and powders of said complex carbide- and/or silicide particles, (b) preparing the Al—V master alloy containing ≦5 wt. % of iron, (c) preparing the Al—V—Fe master alloy fine powder having a particle size of ≦20 μm, (d) mixing the basic powdered blend with the master alloy powder to obtain a chemical composition of TMCC, (e) compacting the powder mixture at room temperature, (f) sintering at the temperature which provides at least partial dissolution of dispersed powders, (g) forging at 1500-2300° F., and (h) cooling. The resulting TMCC has density over 98% and closed discontinuous porosity after sintering that allows making hot deformation in air without encapsulating. The invention can be used to produce near-full density near-net shape parts from titanium matrix composite materials with acceptable mechanical properties without a hot deformation.

A method of producing full density binder-jet printed metallic articles. A metallic 3-D printed article is produced using a binder-jet printing method and is positioned in a hot isostatic press (HIP) container surrounded by stabilization powder. A vacuum is introduced into the inside of the HIP container. A binder used to bond powder articles together in the printed article is removed by heating the HIP container to decompose the binder and removing decomposition products by applying a vacuum to the HIP container. The HIP container is sealed with a vacuum therein and compacted under heat and pressure to remove all porosity in the printed article. The printed article thereafter is removed from the HIP container and finished to a final form.

A method of consolidating particulate materials into articles having combinations of properties not available by conventional processes by liquid phase sintering. These particulate materials are comprised of core particles individually coated with layers of a metal compound having a relatively higher fracture toughness than the core, such as WC or TaC. These coated particles include an outer layer comprised a metal, such as Co or Ni. The particles with these coatings are pressed to form an article and the article densified at pressures and temperatures where full density is achieved without the degradation of the material forming the core particle.

A method and system for operating a DRAM device in either a high power, full density mode or a low power, half density mode. In the full density mode, each data bit is stored in a single memory cell, and, in the half density mode, each data bit is stored in two memory cells that are refreshed at the same time to permit a relatively slow refresh rate. When transitioning from the full density mode to the half density mode, data are copied from each row of memory cells storing data to an adjacent row of memory cells. The adjacent row of memory cells are made free to store data from an adjacent row by remapping the most significant bit of the row address to the least significant bit of the row address, and then remapping all of the remaining bits of the row address to the next highest order bit.

A method of fabricating a sputtering target assembly comprises steps of mixing/blending selected amounts of powders of at least one noble or near-noble Group VIII metal at least one Group IVB, VB, or VIB refractory metal; forming the mixed/blended powder into a green compact having increased density; forming a full density compact from the green compact; cutting a target plate slice from the full density compact; diffusion bonding a backing plate to a surface of the target plate slice to form a target/backing plate assembly; and machining the target/backing plate assembly to a selected final dimension. The disclosed method is particularly useful for fabricating large diameter Ru—Ta alloy targets utilized in semiconductor metallization processing.

The invention relates to laser cladding molding technology; wherein, a common steel base is molded to high-performance material. The requirements for material performance are met during the manufacture process of fine blanking die. To prolong the service life of fine blanking die, the requirements for material are satisfied, which substitutes the costly metallurgical steel powders. Based on the laser cladding molding technology, the manufacture method of the new gradient functional material fine blanking die comprises the steps that: firstly, high-energy laser beam locally melt the metal surface of base to form a molten pool; secondly, metal materials are sent to the molten pool and forms a plurality of new metallic layers with low rate of dilution, combining with the base metal metallurgy. The invention has the advantages of enabling to achieve no-model rapid approximately-final molding of high-performance compact metal components, improving the prior rapid prototype technology to a new level of the directly molding of full-density high-intensity functional material component, and being an integration of rapid molding basic principle and laser process quintessence.

A method for producing TiAl alloy plates through beta-gamma TiAl pre-alloy powder relates to a method for producing TiAl alloy plates. The purpose is to solve problems of the TiAl alloy plates produced by the existing method of macroscopic segregation, dendritic segregation and chemical composition unevenness, poor performance and production difficulty. The method includes: raw material preparing, hot isostatic pressing, sheath packing, high temperature pack rolling and pack removing. The method produces TiAl alloy plates by adopting hot isostatic pressing and follow-up high temperature pack rolling, a large number of disordered body-centered cubic beta phases are introduced in beta-gamma TiAl pre-alloy powder at the processing temperature, thus the hot workability of TiAl alloy can be improved and later TiAl alloy roll forming can be facilitated, and full-density large-size TiAl alloy plates can be produced easily. The method is applicable to producing of TiAl alloy plates.

The invention provides a tungsten alloy material containing yttria and a preparation method thereof by optimizing and selecting of a tungsten alloy composition formulation and a sintering process. The method concretely includes the steps of matching raw material powder according to the following mass percentage: 92.50- 93 .50 of W, 4.50-5.50 of Ni, 1.00-2.00 of Fe and 0.05-0.60 of Y2O3; then uniformly mixing the powder by a roller type flour mixing machine; and then performing charge plasma rapid sintering to the powder with the sintering pressure of 30-50MPa, sintering with the heating rate of 50-300 DEG C/min, sintering at the temperature of 1170-1300 DEG C, sintering and holding for 2-10 minutes and sintering with the vacuum of not more than 4Pa, thereby obtaining a high-proportion tungsten alloy block material which has the characteristics of nearly full-density, high hardness, good bending strength resistance under room temperature, excellent high-temperature mechanical performance, and the like and has good price-performance advantage and broad application prospect.

The invention discloses a rare earth permanent magnet and a preparation method thereof. According to a nano biphase isotropic composite permanent magnet provided by the invention, a general formula of nano biphase rapid quenching alloy powder components based on an atom ratio is RxFe100-x-y-xByMz, wherein x ranges from 6.0 to 11.7, y ranges from 5.0 to 6.0, z ranges from 4.0 to 10.0, R is selected from one or more of Pr, Nd, Tb and Dy, and M is selected from one or more of Co, Ga, Al and Nb. The nano biphase isotropic composite permanent magnet prepared by adopting a vacuum hot pressing method has the characteristics of full density of isotropy, and can be magnetized into a multipole ring with poles of any even number according to the application requirement.

A method is disclosed to form micromolds and micromold components from mixtures of micrometer or nanometer-sized particulates dispersed in an organic binder. Following extraction of the organic binder the green micromolds or micromold components are sintered to full density, upon which they shrink by accurately predetermined amounts. The method allows to achieve complex-shaped micrometer and nanometer-sized precision parts such as MEMS devices and MEMS packages.

The invention discloses a double series reactor process for preparing polyethylene, which comprises the following steps: ethylene and alpha-alkene comonomer react in a first reactor under the effect of a composite catalyst, the material in the first reactor after reaction is directly transferred to a second reactor, and ethylene and hydrogen react in the second reactor. The composite catalyst comprises: (1) a Ziegler Natta catalyst loaded on a carrier; (2) a polymer layer covered on the Ziegler Natta catalyst loaded on the carrier; and (3) a metallocene catalyst loaded in or loaded on the polymer layer. High molecular weight low-density polyethylene is produced in the first reactor, and low-molecular weight high-density resin is produced in the second reactor. No degasser is additionally arranged in the series polymerization process. The obtained polyethylene blend product has a melt flow ratio of about 40-500 and full density polyethylene of 0.900-0.975g/cm3.

The invention belongs to the technical field of rare-earth permanent magnet brazing, and particularly relates to a welding method for sintered NdFeB permanent magnets. The method is implemented in the manufacturing process of the sintered NdFeB permanent magnets and includes the following steps that 1, full-density blanks obtained after NdFeB sintering are machined to obtain a needed shape, and brazing filler is clamped between the welding end faces of two NdFeB blank machined parts needing to be welded and then is compressed; 2, the NdFeB blank machined parts with the brazing filler clamped are placed in a tempering furnace, and welding is completed while tempering treatment is performed. The method solves the problem that the NdFeB permanent magnets can not be welded, and can completely meet various welding requirements for performance, dimensions and shapes of the NdFeB permanent magnets. The welding process is also a process of improving the microstructure and coercivity of the NdFeB permanent magnets, subsequent magnetic performance of the magnets is not influenced, and production process cost increase caused by welding is avoided. The brazing bending strength of the magnets welded through the method is 8 times higher than that of magnets bonded through epoxy resin.

A dual mode, full density/half density SDRAM includes a refresh controller specifically adapted to refresh memory cells of the SDRAM in the half density mode at a rate that is significantly slower than the rate at which the memory cells are refreshed in the full density mode. In the full density mode, the refresh controller increments a counter at a rate that is half the rate the counter is incremented in the full density mode. A refresh trigger pulse, which initiates the refresh of the memory cells, is generated when the counter has incremented to one of a first counter stage in the full density mode and a counter stage two stages beyond the first counter stage in the half density mode. Circuitry is also provided for ignoring some auto-refresh commands applied to the SDRAM in the half density mode so that the memory cells are also refreshed less frequently in the auto-refresh mode. The SDRAM also includes circuitry for remapping one of the row address bits for use as a column address bit in the half density mode so that the SDRAM can interface with system adapted for conventional dual mode SDRAMs.

A vibratory powder consolidation process is provided in which a powder material is subjected to vibratory energy while under static compressive loading. The process provides rapid, full-density powder consolidation with minimum or no structural degradation.