Introduction of tungsten target

Tungsten targets are mainly used in aerospace, rare earth smelting, electric light source, chemical equipment, medical equipment, metallurgical machinery, smelting equipment, petroleum, and other fields.

Brief introduction

Tungsten is a rare metal and an important strategic material. China is a major tungsten-producing country with 5.2 million tons of tungsten resources, accounting for 65% of the world's total reserves and ranking first in the world in terms of production and export volume. Hunan, Jiangxi and Henan provinces have the top three tungsten resources reserves in China, of which Hunan and Jiangxi provinces account for 55.48% of the country's tungsten resources reserves. Hunan is mainly wolfram and Jiangxi is mainly wolfram, and its wolfram resources account for 42.40% of the total wolfram resources in China. Tungsten is a rare and high melting point metal, belonging to the VIB group of the sixth period (second longest period) of the periodic table. Tungsten is a silvery-white metal with a steel-like appearance. Tungsten has a high melting point, a low vapor pressure, and a low evaporation rate.

Physical Properties

Elemental symbol: W

Atomic number: 74

Stable isotopes and their percentages: 180 (0.14); 182 (26.41); 183 (14.40); 184 (30.64); 186 (28.41)

Relative atomic mass: 183.85

Electronic structure of the free atom: 1s22s22p63s23p63d104s24p64d104f145s25P65d46S2

Atomic volume: 9.53 cm3/mol

Density: 19.35 g/cm3

Crystal structure and lattice constant: α-W: body-centered cubic a=3.16524 nm (25°C)

β-W: cubic lattice a=5.046 nm (stable below 630°C)

Melting point: 3410±20℃

Boiling point: 5927°C

Latent heat of melting: 40.13±6.67kJ/mol

Heat of sublimation: 847.8 kJ/mol(25℃)

Heat of evaporation: 823.85±20.9kJ/mol(boiling point)

Resistance temperature coefficient: 0.00482 I/°C

Electron escape work: 4.55 eV

Thermal neutron capture surface: 19.2 b

Modulus of elasticity: 35000~38000 MPa (silk)

Torsional modulus: ~36000Mpa

Bulk modulus: 3.108×1011-1.579×107t+0.344×103t2 Pa

Shear modulus: 4.103×1011-3.489×107t+7.55×103t2 Pa

Compressibility: 2.910-7 cm/kg

Tungsten has two variants, α and β. At standard temperature and atmospheric pressure, α is a stable body-centered cubic structure. β tungsten occurs only in the presence of oxygen. It is stable below 630°C and is converted back to alpha tungsten above 630°C, and the process is irreversible.

Purity: tungsten 99.95% or more

Density: 19.35g/cm3

Surface condition: polished or alkaline washed

Features

After spraying and sintering, the tungsten target has 99% density or even higher, the average transparent texture diameter is 100um or even smaller, oxygen content is 20ppm or less, and the deflection angle force is about 500Mpa; it improves the production of unprocessed metal powder and improves the sintering ability, which can make the cost of tungsten target stable at a low price. The sintered tungsten target has a high density, a high level of transparent frame that cannot be achieved by conventional press sintering methods, and a significant improvement in deflection angle, resulting in a significant reduction in particulate matter.