+86-731-28622059        sales@nmtmetals.com

Technological innovation

Technological innovation

Metal surface nano


Sapphire is a tungsten-rhenium alloy wire metallurgy, processing and electrochemical machining pressure as the main technical expertise to the wire with different characteristics, rods and products for the product, in order to create a single crystal sapphire for the main application areas

It is a system of tungsten industry has a branch high technological content and added value.



1 Sapphire tungsten-rhenium alloy wire Profile

Sapphire tungsten-rhenium alloy wire is an alloy of tungsten and rhenium wire composed in varying proportions.

Common models are:

W-3Re (rhenium containing 3%)

W-5Re (rhenium-containing 5%)

W-20Re (containing 20% ??rhenium)

W-25Re (containing 25% rhenium)

W-26Re (containing 26% rhenium)

Wherein, Model W-25Re (containing 25% rhenium), 0.5mm diameter tungsten-rhenium alloy wire now widely used in the manufacture of a single crystal sapphire.

Production process

1.1 powders and doping

Proportional reduction of low temperature pre-preparation phase composition suitable blue tungsten oxide, and blue tungsten oxide is doped tungsten powder pickling, depending on the demand for regulation of tungsten powder and rhenium powder.

The first element of uniformity of doping control, to be able to obtain a stable purity, scale, and the particle size of these three indicators requirements.

The use of advanced hydrogen reduction equipment, as well as doping, pickling, high-capacity V-blender, especially optimized for hydrogen production systems to provide a reliable guarantee for the implementation of powder technology

1.2 billet molding and sintering processing technology

Using isostatic round billet rolling after a sintered billet, which is the cable through the tungsten and molybdenum most advanced processing technology, preparation of billet unit weight 3 kg, the use of power-controlled vertical melting equipment, stable obtain density, purity and crystal

Granularity main indicators in line with the requirements of tungsten-rhenium billet.

Blooming rolling method to adapt a large billet, to achieve high-quality, large-scale production of the best processing methods. Beijing claims through the use of tungsten and molybdenum Technology Co. KDCKS three roll mill and multi-rack system technology to master it. At present, most

Businesses still use swaged hair blooming, but aspects of open technology and equipment, molds, and other ancillary facilities has shrunk, with advanced and rationality.

1.3 swaging and stretching techniques

Multimode string forging more with welding, high frequency continuous annealing, Big Wheel and multimode continuous drawing machine drawing machine application, using a large compression rate processing, oxidation annealing, such as the use of condensate crystal drawing dies, the composition of this section technical features.

Using a large compression ratio stretching, tungsten-rhenium wire protection has good high temperature performance with excellent positive. Pass compression ratio has been adopted specifications, ¢ 3.7-0.7mm range of 30% -40%, ¢ 0.7-0.2mm area

Between 18% -28%. Four to ten mold sliding mode multimode drawing machine has been applied.

1.4 Electrochemical Processing Technology

Because tungsten-rhenium alloy wire sapphire white silk with multi-supplier to state, so it is necessary to wash separately electrolytic corrosion, galvanic corrosion and electrolytic polishing reducing effect.

1.5 Management and Control TechnologyFailure usually metal engineering materials often begin to surface, such as fatigue cracking, friction and wear and corrosion; after treatment by surface nano, nano-structure layer can be formed on the surface, thereby enhancing the overall performance of the material, increasing the service life of the workpiece. Surface nano into nanotechnology with conventional materials combine to provide a practical way, cleverly avoiding the technical problems encountered in the preparation of bulk nanomaterials will play a huge development potential in the industry.

Mechanical surface treatment method is a major way to achieve the metal surface of the nano. The method of the surface material in repeated action applied load, the material surface to produce a strong plastic deformation grain refinement. Commonly used methods are: 1) ultrasonic shot peening technology. The technology is a large number of spherical projectile container placed in a U-shape, the upper container is fixed sample, the lower vibration generator is connected, by stimulating the projectile, high-speed collision sample surface, thus producing a strong plastic deformation, and ultimately nano . Currently, the ultrasonic peening method has been successfully applied in 316L stainless steel, mild steel and other materials. 2) supersonic particle bombardment. The technology uses gas - solid two-phase flow as a carrier, with a supersonic flow (flow rate of up to 300 ~ 1200 m / s) hard to carry a very high kinetic energy of the solid particles bombarding the metal surface to produce a strong plastic deformation, the grain refinement to the nanoscale. Compared with other methods, this method has high efficiency, device flexibility, solid particles reusable recyclable, no environmental pollution, etc., has been successful for 16MnR low alloy steel and stainless steel surface 0Cr18Ni9 nanometer process. 3) surface mechanical milling techniques. The technique relies on a hemispherical tip tool at a constant speed on a cylindrical sample is rotated while sliding in the horizontal direction, the surface of the material plastic deformation region, so as to refine the grain. The method is suitable for the preparation of nano rod-shaped surface material - micron graded surface layer, solves the problem of bar processing.

Surface nano materials by changing the organization and structure of the surface, so that the surface properties of the material so that overall performance of the entire material obtained significantly improved. 1) The surface of nano technology can be formed on the surface of the nano-layer surface, thereby increasing the surface hardness and strength, while the internal plastic coarse-grained material well-preserved, making the overall mechanical properties of the material significantly increased. According to the literature, low carbon nano its uppermost surface micro-hardness than the core part matrix hardness increased about 3-fold. 316L stainless steel surface nano technology to improve the yield strength from 280 MPa to 550 MPa, ultimate tensile stress increase of about 13%. 2) the surface of nano material surface hardness increased significantly, the core part matrix hardness several times. Help to enhance the hardness increase friction and wear properties of materials, and can effectively suppress the generation of surface cracks, while coarse grain structure will prevent the central portion of the crack growth, thereby improving fatigue resistance of the material. According to reports, after GCr15 steel surface nano-materials processing to improve the wear resistance of 1 times, and worn by adhesive wear mechanism into abrasive wear. 316L stainless steel nano surface treated steel fatigue life is 1.15 to 1.60 times the original steel. 3) material surfaces after nano will have a lot of structural defects, become fast diffusion path atoms, can effectively improve the quality of the material surface carburizing, speed and nitrogen alloying process and the nitrided layer.tungsten and rhenium ammonium rhenium wire entire process measurement and control products and management techniques to develop more scientific focus process measurement and control standards, and has a full range of advanced testing methods,

Beijing claims through tungsten and molybdenum Ltd. is focused on creating ¢ 1.0-0.2mm range of crack detection system.

1.6 Equipment and Technology

Mixer, reduction furnace, vertical melting equipment, rotary forging machine, drawing machine, electrochemical etching equipment, testing equipment and packaging machines

3: Packaging

Each volume 400-600g, per kilogram of 250m-260m. Vacuum-packed, jackets cartons, bags.