Refractory metals refer to metals with a melting point above 2000 ℃, including tungsten, molybdenum, tantalum, niobium, rhenium and vanadium. This article only covers the first 5. The common characteristics of refractory metals and their alloys are high melting point, high high temperature st...

1 Introduction   Niobium metal, as a metal with low density among refractory metals, has high melting point, high high-temperature strength (highest specific strength in the range of 1093~1427C), good room temperature processing performance, weldability and corrosion resistance, and no radioact...

1. Introduction    Spherical powders were preferred for three dimensional (3D) printing [1–5], thermo spraying [6,7] and spark plasma sintering [8–10] due to its better flow ability and higher apparent density than irregular powders. Nevertheless, there are only a limited numbe...

1 Introduction Ta and W are both high-density, rare and refractory metals, among which Ta has the advantages of high melting point, good mechanical properties, high thermal conductivity, good chemical stability and strong corrosion resistance [1]. The Ta-10W alloy developed by combining the characte...

1. Introduction Tungsten, due to its inherent characteristics like high melting point,good thermal conductivity, high hardness, and oxidation resistance, is used in many critical components across a wide range of applications in electronics, medicine, defense, etc. [1]. The production of tungsten in...

Tantalum is a "biophilic" transition metal that has been widely used in clinical practice as a medical implant material for nearly 80 years [1-2]. In recent years, with the rapid development of materials science, medical porous materials have gradually replaced solid metals and have been used in a v...

W-Ni high-density tungsten alloys, including W-Ni-Cu and W-Ni-Fe alloys, are the main material systems of tungsten alloys. They have a series of characteristics such as high density, high strength and hardness, good electrical and thermal conductivity, low thermal expansion coefficient, excellent co...

Metal injection molding (MIM) technology is a new type of powder metallurgy near-net forming technology that has developed most rapidly in the world in recent years. Its advantage is that it can directly form various complex shapes of metal parts at one time, just like forming plastic parts. In addi...

As an important refractory metallic material, tungsten has important applications in many fields due to its high melting point, high thermal conductivity, low vapor pressure, and resistance to irradiation damage, and it is considered to be one of the most promising candidates for fusion reactors [1-...

0 Introduction Molybdenum-tungsten alloy is an alloy composed of molybdenum and tungsten. Molybdenum and tungsten are elements of the same family, with the same atomic radius, belonging to the same body-centered cubic lattice, with little difference in lattice constants, and can form a uniform solid...

1 Introduction Ta-10W alloy is a rare metal alloy material with high density, high melting point and high strength. It has high high-temperature strength, good ductility, weldability and excellent corrosion resistance. It is suitable for working environments such as high temperature, high pressure a...

Abstract: The welds of the Nb521 alloy transition connection ring and the nozzle body cracked and leaked during the vibration test after the hot test. The mechanism of the welding cracks was analyzed by macroscopic, scanning electron microscope fracture analysis, energy spectrum and XRD analysis. It...