37results about How to "Increase the number density" patented technology

Radionuclides are produced with a pulsed neutron flux from a multiple repetition rate staged Z-pinch machine, the pulsed neutron flux is moderated, an activatable radionuclide precursor is exposed to the moderated pulsed neutron flux, and a corresponding radionuclide from the activatable radionuclide precursor is produced. High current pulses are passed through a target plasma of fusible material enclosed in a cylindrical liner plasma composed of a high-Z plasma to generate a magnetic field that compresses the liner plasma, and generates shock waves. The shock implodes the target plasma. The shock front propagates between an outer shock front and an axis of the target plasma so it is heated through shock dissipation and by adiabatic compression due to an imploding shock front produced in the outer liner plasma to fuse light nuclei and generate alpha particles and neutrons. Alpha particles trapped within the magnetic field further heat the target plasma.

This aluminum alloy sheet has increased BH properties under low-temperature short-time-period conditions after long-term room-temperature aging by means of causing aggregates of specific atoms to be contained having a large effect in BH properties, the distance between atoms being no greater than a set distance, and containing either Mg atoms or Si atoms measured by 3D atom probe field ion microscopy in a 6000 aluminum alloy sheet containing a specific amount of Mg and Si.

In a method of forming carbon nano-tubes, a catalytic film is formed on a substrate. The catalytic film is then transformed into preliminary catalytic particles. Thereafter, the preliminary catalytic particles are transformed into catalytic particles. Carbon nano-tubes then grow from the catalytic particles. The carbon nano-tubes have relatively high conductivity and high number density.

The invention discloses a high-strength heat-conducting magnesium alloy and a preparation method thereof. The element content of the magnesium alloy is: Zr: 0.2-0.6wt.%, Zn: 4-6wt.%, Ca: 0.4-0.8wt.%. The amount is Mg. The preparation method of the magnesium alloy includes batching, adding magnesium ingots, adding intermediate alloys, refining, casting, solid solution treatment, extrusion deformation, solid solution treatment again and aging treatment. In order to promote the formation of alloy Zn-Ca clusters, different Zn-Ca master alloys are selected during smelting, and a short-term solution treatment of no more than 1h is performed after hot extrusion. The tensile strength of the alloy is greater than 325MPa, the yield strength is greater than 280MPa, the elongation is greater than 15%, and the thermal conductivity is greater than 120W·(m·K) ‑1 , the magnesium alloy has a high yield, good formability, easy industrialization, and can be used as a heat dissipation structural material for power supplies and electronic devices in the field of new generation aerospace.

The invention discloses a high-strength and high-temperature-resistant low-scandium composite microalloyed Al-Cu alloy and a heat treatment process thereof. Its main alloying elements include Cu, Sc, Si, Zr, Er, Ti, Mn, Fe as an impurity element should be limited to <0.15% by mass, and the rest are Al and unavoidable impurities. The alloy ingot is cast by conventional metal mold or sand mold casting, and can be hot deformed before solution treatment. The corresponding heat treatment process includes multi-stage homogenization and subsequent isochronic aging treatment. At the same time, it should be noted that for alloy materials with high Cu content, a more gentle homogenization treatment (lower temperature, prolong the holding time) and slower heating in the low temperature range Aging heating rate. The Al-Cu alloy material prepared according to this patent reduces the use of expensive Sc elements through appropriate composite microalloying means and structure design, significantly improves the high-temperature tensile properties of the alloy, and has good room temperature mechanical properties and 300 -400℃Excellent high temperature tensile strength and creep resistance.

A method for forming a semiconductor device includes, sequentially, providing a substrate having a first region and a second region; forming a first dielectric layer on the substrate; forming a second dielectric layer having a plurality of first openings exposing portions of a top surface of the first dielectric layer; forming a first conductive layer in the first openings; etching the second dielectric layer and the first dielectric layer in the second region until the substrate is exposed to form a plurality of second openings; forming passivation regions in portions of the substrate exposed by the second openings; exposing the surface of the first dielectric layer in the second region; forming a third dielectric layer on the surface of the first dielectric layer and in the second openings; and forming a second conductive layer, a portion of which is configured as an inductor, over the third dielectric layer.

The invention discloses a nano-composite oxide dispersion-strengthened molybdenum alloy and a preparation method thereof, belonging to the field of refractory metal matrix composite materials. With molybdenum metal element powder, Y 2 O 3 Powder and Mo 2 Zr alloy element powder is used as raw material, the alloy components are uniformly mixed and packaged in proportion, and the Y 2 O 3 It is solid-dissolved with Zr in a molybdenum matrix to prepare a composite powder, and then the powder is solidified by spark plasma sintering, and the nano Zr-Y-O composite oxide is precipitated to prepare a nano-composite oxide dispersion-strengthened molybdenum alloy. The present invention utilizes Y 2 O 3 The solid solution and reprecipitation mechanism of the molybdenum is formed by adding Zr element, Y element and free oxygen to form a Zr-Y-O composite oxide with a fluorite structure. While removing the free oxygen in the molybdenum matrix, the oxide particles are refined to 5 ~30nm; and the oxide particles precipitated in situ have a coherent / semi-coherent relationship with the molybdenum matrix, and most of them are distributed in the grains, which play a role in precipitation strengthening, which can significantly improve the mechanical properties and radiation resistance.

The invention relates to a preparation method of zirconium dioxide dispersion strengthened copper alloy, and belongs to the field of metal-based composite materials and preparation technics. Through oxidation of Cu-Zr amorphous master alloy, Cu-ZrO2 combination with specific gravity close to that of matrix Cu can be obtained in advance, the Cu-ZrO2 combination is used as raw material and is mixedwith pure metal materials of copper and chromium, the mixture is directly prepared and smelted to obtain ODS-Cu with uniform and controllable structure or ODS-CuCrZr alloy. The method overcomes the floating problem of ZrO2 powder caused by the large difference between the specific gravity of the oxide and the matrix in past smelting process, gives full play to the advantages of amorphous alloy structure, uniform composition, large solid solubility of oxygen and high diffusion efficiency in the amorphous alloy to control oxygen addition amount of the alloy, and realizes effective regulation andcontrol of the size, number density, morphology and distribution density of ZrO2 reinforced particles; and ODS-Cu with uniform structure and the ODS-CuCrZr alloy are obtained through a casting process, so that the technological process is simple, efficient, controllable and easy to realize large-scale production. The room-temperature conductivity of ZrO2 dispersion strengthened high-strength high-conductivity copper alloy prepared by the method can be better than 85% IACS, and the room-temperature tensile strength and the plastic strain can reach 400 MPa and 35% respectively.