Product

Tungsten Copper
Tungsten Copper with Gradient Structure 597

Tungsten copper (W-Cu) and molybdenum copper (Mo-Cu) are composed of respectively tungsten and molybdenum with copper, which called two-phase composites and has many advantages when it used in some devices with high power, such as high hardness, high strength, high melting point, excellent chemical stability, excellent thermal and electrical conductivity and lower coefficient of thermal expansion. As a kind of electronic packaging heat sink material takes place of conventional materials gradually, the related researchers make an intensive study on tungsten…

Tungsten Copper
Effect of Copper Content on Tungsten Copper Electrode Properties 588

Except the granularity of tungsten powder, copper (Cu) content also has an influence on the comprehensive properties of tungsten copper electrode. There is product with different copper content by two kinds of infiltration process (Conventional infiltration CV, Microwave infiltration MW) comparison: The table to compare the performance of tungsten copper alloy electrodes by different proportions of the product relative density, electrical conductivity and Brinell hardness (HB) and several parameters under different infiltration process. View from the sheet, we can easily…

Product
What Is Ammonium Paratungstate 2,671

What is ammonium paratungstate? Ammonium paratungstate is white crystalline of flake or needle shape, it is short for APT. Chemical formula: H8N2O4W Molecular Weight: 283.9145 EINECS: 234-364-9 CAS No.: 14311-52-5 According to different crystalline condition, its chemical formula has different forms: (1)3(NH4)2O?7WO3?6H2O (2)5(NH4),2?12WO3?5H2O (3)5(NH4)2O?12WO3?5H2O (4)5(NH4)2O?12WO3?11H2O Ammonium paratungstate is usually in forms of pentahydrate and decahydrate: 1.Decahydrate: chemical formula is 5(NH4)2O?12WO3?10H2O, molecular weight is 3222.73. It is produced by evaporate tungstic acid soluble in ammonium solution, has the shape of needle…

Product
Methane Partial Oxidation and Ammonium Metatungstate Synthesizing Tungsten Carbide Supported Cobalt Nickel Catalyst 809

Partial oxidation of natural gas for preparing synthesis gas is an important intermediate link for realizing the transformation of natural gas, while the researching and development of efficient catalyst is the key. As the main component of natural gas, the new synthetic route of methane as alternative energy for manufacturing high value-added liquid chemicals and other organic chemical is attached great concerns all around the world. The preparation of tungsten carbide supported of cobalt nickel catalyst by the synthesis gas…

Product
Arsenic Doped Ammonium Metatungstate Preparing Nano Tungsten Powder 1,215

Arsenic doped ammonium metatungstate (AMT) is generated by adding ammonium metatungstate into the nitric acid solution of elemental arsenic and stirring, drying and grinding, the excellent raw material for preparing nano tungsten powder. Nano tungsten powder is the tungsten powder which the particle size is fine to nanoscale, at present, the traditional method for manufacturing nano tungsten powder is tungsten oxide reduction method, wherein the reducing agent maybe hydrogen or carbon; with the appearing of nano materials, the manufacture methods…

Product
High-Purity Tungsten Powder 3,696

High-purity tungsten powder has the purity of at least 99.99%, with chemical purity from 99.99%~99.9999%; the content of impurity elements in it should be among (0.1～1000)×10-12, however, as for the some special elements like radioactive, alkali metal, heavy metals and gas elements ect., their content of will be special required respectively. The products of high-purity tungsten powder are high purity tungsten bar, rod, electrode, wire, sheet, plate, and pure tungsten and titanium tungsten sputter targets material ect.. Preparation of High-purity…

Product
Native Tungsten Carbide Powder 1,349

Native tungsten carbide powder refers to WC prepared from native tungsten powder and carbon, which is the so called tungsten carbide powder. A relatively product of native tungsten carbide powder is the reproduced tungsten carbide powder, which refers to WC prepared from waste hard alloy, waste tungsten powder or other recycling material. Native tungsten carbide powder (WC) is the main raw material for the production of cemented carbide, black hexagonal crystals with metallic luster, which has the hardness closes to…

Product
Nickel Based Tungsten Carbide Powder 762

Nickel based tungsten carbide powder mainly refers to tungsten carbide powder (WC) on the basis of self-fluxing nickel-based alloy to enhance its hardness and wear-resistant. The main products of self-fluxing nickel-based alloy powder are nickel-chromium boron-silicon and nickel-boron-silicon alloy, which have overall performance of low melting point, good self-fluxing, excellent wear, corrosion and heat resistance and anti-oxidation, to be the most widely and earliest used self-fluxing alloys. Nickel based tungsten carbide powder can be divided into two types of mechanical…

Product
Tungsten Copper Electrode Metallographic Phase and Properties Analysis 647

Tungsten copper powder sintered material morphology distribution of tungsten skeleton evenly distributed on the copper matrix. Due to the nature of tungsten (W) high melting point and high hardness, tungsten at 1000 ℃, its ultimate tensile strength is still 50kgf/mm2, low carbon intensity is even higher than room temperature, which makes tungsten copper material copper melting point below the temperature (about 1000 ℃), still has a very high wear resistance and heat hardness. The tungsten skeleton with copper as matrix…

Product
Nano Tungsten Copper Electrode Research 704

The granularity and uniformity of tungsten and copper powder has an effect on tungsten copper electrode sintering, and the decreasing granularity will improve the comprehensive properties of materials, such as the density, the hardness, the electric and thermal conductivity. Theoretically, powder metallurgy (PM) uses metal powder (or metallic oxide powder) as raw materials, after compacting and sintering, the granularity of powder is coarser. Compared with PM, nano tungsten copper has higher surface energy, which atoms move by higher interfacial energy,…

1 … 199 200 201 202