The results of hafnium carbonitride sintering with silicon carbide addition showed that already at a temperature of 1800 °C it is possible to obtain dense material. For sintering of the Hf(C,N)-based composites, this temperature was set as optimal to minimize the energy consumption.

This feature allows the fabrication of binary tantalum-hafnium carbide (Ta,Hf)C [26, 41, 42] as well as carbonitride HfCN phases [13, 43, 44]. In the Ta-N system, the nitride phase at room temperature has a hexagonal structure, which makes the formation of a single-phase solid solution in the TaC-TaN pseudo-binary system difficult using the ...

Hafnium carbide (HfC) is a potential candidate of ultrahigh-temperature ceramics (UHTCs) and has attracted significantly widespread interest in recent years. Here, we have synthesized high-purity HfC samples with NaCl-type structure by using a high-pressure solid–solid reaction. The structural stability, equation of state, plastic …

In particular, the team from Imperial College London discovered that the melting point of hafnium carbide is the highest ever recorded for a material. Being able to withstand temperatures of nearly 4000°C could pave the way for both materials to be used in ever more extreme environments, such as in heat resistant shielding for the next ...

Molybdenum Hafnium Carbide (or Carbon) Alloy is a particle-reinforced molybdenum-based alloy containing hafnium carbide in the proportions of 0.8-1.4% hafnium and …

Visit ChemicalBook To find more HAFNIUM CARBIDE(1) information like chemical properties,Structure,melting point,boiling point,density,molecular formula,molecular weight, physical properties,toxicity information,customs codes. You can also browse global suppliers,vendor,prices,Price,manufacturers of HAFNIUM …

Among them, HfC has a melting point of 3890°C and has excellent properties. such as high hardness, high thermal conductivity, high electrical conductivity, and expansion coefficient. At high temperatures, its oxide HfO2 has high viscosity and can form a dense. protective layer, with good high temperature oxidation resistance, is an important ...

The subject invention is a process for treating the surface of a carbon based material to convert it to a hafnium carbide ceramic. The process uses elemental hafnium to chemically react with the carbon in the surface to form HfC, to a depth which depends on the process variables. The process includes application of a coating slurry that ...

Our results are promising and suggest that hafnium carbide may be a material that could shield these planes from heat generated by friction between air and the plane's surface." Everything old is new again. Scientists first began experimenting with hafnium carbide in the 1960s and showed that it could withstand temperatures of …

Layered Hafnium Carbide/Silicon Carbide. Hard, wear-resistant, chemically inert, chemically resistant, and nearly impervious to hydrogen at high temperatures, refractory carbides can be formed by chemical vapor deposition at temperatures as low as 10% of their melting point. Ultramet offers the following materials, along with other carbides ...

and 1 part hafnium carbide with graphite Columbium carbide with graphite 8 Parts tantalum carbide and 1 part zirconium carbide with graphite ... insert materials were obtained from commercial sources in semifinished form, and final machining was performed at the Research Center. The reinforced-plastic nozzles

In this article, we'll take a look at 4 common uses of hafnium. Uses of Hafnium. 1. Uses of Hafnium in the Field of Electronic Materials. Since hafnium emits electrons easily, it can be used as a cathode for X-ray tubes. In addition, alloys of hafnium and tungsten or molybdenum are also used as electrodes for high-voltage discharge tubes.

These unique combinations of properties make them promising materials for extremely environmental structural applications in rocket and hypersonic vehicles, particularly nozzles, leading edges, and engine components, etc. ... Synthesis of ultra-fine hafnium carbide powder and its pressureless sintering. J Am Ceram Soc 2010}, 93: …

Description Produced by reacting hafnium oxide and carbon at high temperatures. An excellent refractory. Hafnium carbide is the most refractory binary compound known. Formula: HfC Packaging 50 lbs. …

See more Hafnium products. Hafnium (atomic symbol: Hf, atomic number: 72) is a Block D, Group 4, Period 6 element with an atomic weight of 178.49. The number of electrons in each of Hafnium's shells is 2, 8, 18, 32, 10, 2 and its electron configuration is [Xe] 4f 14 5d 2 6s 2.

Hafnium is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity ). Elemental or metallic forms of hafnium include pellets, rod, wire and granules for evaporation source material purposes. Hafnium nanomaterials provide ultra-high surface area which nanotechnology research and recent experiments ...

Methods to produce hafnium and tantalum carbide (HfC and TaC) materials from literature have reported several routes that have led to the successful production of these materials in fiber and powder form . However, most of these methods utilize harsh reagents and halide precursors of the refractory transition metal, which are known to lead to ...

Hafnium carbide is proposed as a structural material for aerospace applications at ultra high temperatures. The chemical vapor deposition technique was used as a method to …

Abstract. Hafnium carbide powder was synthesized by sol-gel polycondensation of hafnium chloride with citric acid. The starting materials were dissolved in water and mixed homogeneously on a hot ...

Hafnium carbide (HfC) and tantalum carbide (TaC), as potential ultra-high temperature ceramics, have attracted widespread attention due to their unique physical and chemical properties. Here, dense polycrystalline HfC and TaC bulk ceramics are synthesized in one step by the high pressure and high temperature (HPHT) method.

The first stage in the development of the technique for producing thin coatings of hafnium carbide on carbon-carbon composite material (CCCM) surfaces at relatively low synthesis temperatures for reducing the arising thermal stresses is presented. The process of formation of hafnium carbide on the surface of CCCM in the HfCl4–CH4–Ar system …

Hafnium carbide (HfC) is a potential candidate of ultrahigh-temperature ceramics (UHTCs) and has attracted significantly widespread interest in recent years. Here, we have synthesized high-purity HfC samples with NaCl-type structure by using a high …

While hafnium nitride is the most refractory of all the metal nitrides, hafnium carbide is the most refractory of all the binary materials. With a melting point of about 3900 °C it is one of the most refractory binary …

Hafnium carbide HfC (at%: 42%C; 49%Hf; 7%O) was investigated under rapid heating by a current pulse, in a time of 5–8 μs. The temperature was measured by radiance of a flat surface of a carbide ...

High-performance refractory materials [1{5] play an important role in applications rang-ing from gas turbines to heat shields for hypersonic vehicles. With melting points above 4000 K, hafnium carbide [6{12] and tantalum carbide [6, 13, 14] are among the most refrac-tory binary compounds known to date [15]. Their mixture Ta 4HfC 5 melts …

Hafnium Carbide (HfC) Sputtering Targets Overview Our comprehensive offering of sputtering targets, evaporation sources and other deposition materials is listed by material throughout the website. Below you will find budgetary pricing for sputtering targets and deposition materials per your requirements.

Hafnium carbide (HfC) and carbonitride (HfC x N y) nanoparticles were synthesized via reduction of HfO 2 oxide with calcium hydride in the presence of carbon or carbon/nitrogen, refractory phases were synthesized at 1473 K, respectively. The average particle size of the obtained materials was in the range of 50–90 nm, allowing them to be …

Carbon fiber reinforced silicon carbide-hafnium carbide (C/SiC-HfC) composite was prepared by precursor infiltration and pyrolysis process. Then, ablation behavior of C/SiC-HfC was evaluated in plasma wind tunnel. It was found that oxide layer formed during ablation significantly influenced the surface temperature. Formation of …

Hafnium carbide HfC (at%: 42%C; 49%Hf; 7%O) was investigated under rapid heating by a current pulse, in a time of 5–8 μs. The temperature was measured by radiance of a flat surface of a carbide plate (thickness 130 microns) at a given emissivity. This carbide plate was clamped between two K-8 plates, to prevent evaporation of the …

The triple hafnium -carbon-nitrogen system, hafnium carbonitride (Hf-C-N), was chosen, as scientists from Brown University (U.S.) previously predicted that …