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 …

2. Synthesis Methods. Zirconium and hafnium carbides and nitrides can be synthesized by direct reaction of metal or metal hydride powders with graphite or N 2.The reactions are strongly exothermic and can be used in a self-propagated high temperature synthesis (SHS) process [].The reaction of oxides with graphite (carbothermal process) is …

HfC is Halite, Rock Salt structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Hf4+ is bonded to six equivalent C4- atoms to form a …

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 produce monolithic hafnium carbide (HfC) and tantalum carbide (TaC). The microstructure of HfC and TaC were studied using analytical techniques. The addition of …

The TPS is an isolator material which have range temperature −121 °C until 1.649 °C. This paper analyzes Tantalum Carbide (TaC) and Hafnium Carbide (HfC) for spacecraft material. We show that Tantalum Carbide (TaC) and Hafnium Carbide (HfC) would rise above the TPS materials temperature. The comparison among RCC, HRSI, …

Hafnium carbide ismore ... shows promise as a high-temperature creep-resistant material. The high-temperature oxidation resistance of Mo{sub 5}Si{sub 3} has been found to be poor, however, limiting its use in oxidizing atmospheres. Undoped Mo{sub 5}Si{sub 3} exhibits pest oxidation at 800 C. Mass loss occurs in the temperature range …

Hafnium Carbide (HfC) is the most refractory binary compound known to man. Density, melting point and electrical resistivity data are provided. ... (EBSD) in …

of ultra-high-temperature materials is a family of binary compounds such as carbides, borides, and nitrides with the melting points above 3000°C. Hafnium carbide is a material with the highest melting point among the car-bides, nearly 3900°C, and, the melting point of hafnium oxide, which occurs at the surface of HfC in an oxidiz-

where T is temperature, K, and x is the value of index in HfC 1−x formula (Eqs. ()–() were recommended for the range of temperatures from 1200 to 2500 K).The thermodynamic functions of stoichiometric hafnium carbide are tabulated by Turchanin et al. [58, 59] in the range of 0–3000 K, by Schick [] in the range of 0–3900 K and by Barin …

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 …

Tags: Hafnium carbide (1/1) Hafnium carbide Material Details; Final Magnetic Moment 0.000 ... Some internal testing by the Materials Project supports these statements; typically, we find that band gaps are underestimated by ~40%. We additionally find that several known insulators are predicted to be metallic.

Hafnium carbide was generated over 1600 °C and the crystal structure resembled the NaCl structure with a F m −3 m space group and lattice constant a = 4.638. At a sintering temperature of 2000 °C, the grain size of hafnium carbide was approximately 40 nm. HfC crystals were located uniformly in the SiC grains or among grain-boundaries.

(It meant the atomic weight of zirconium was wrong and hafnium-free material had to be produced in order for this to be determined.) ... 3,990 0 C. Moving up to compounds of three elements, the mixed carbide of tungsten and hafnium has the single highest melting point of any known compound at 4125 0 C.

Materials The chemical compositions of the hafnium carbide dispersed Me and W alloy wires examined in this study are given in Table L MoHtt2 wires, Me with hafnium carbide, were the HfC dis--pcrs_ simpleMo-base alloys,andMoHfC+45W andMoHfC+25W wireswere theHfC dispersed and alloyed with 49.5% W and 30.4% W, respectively.

@article{osti_22590819, title = {Hafnium carbide formation in oxygen deficient hafnium oxide thin films}, author = {Rodenbücher, C. and Hildebrandt, E. and Sharath, S. U. and Kurian, J. and Komissinskiy, P. and Alff, L. and Szot, K. and University of Silesia, A. Chełkowski Institute of Physics, 40-007 Katowice and Breuer, U. and Waser, …

In addition, HfC structural can be made into high-temperature components or used as thermal insulation materials. Hafnium carbide (HfC) whose melting point exceeds 3890°C is a refractory binary compound. HfC and NBC can also be used as refractory coatings in nuclear reactors. The mixed carbide Ta4HfC5 has the highest …

Hafnium carbide (HfC) is a potential candidate of ultrahigh-temperature ceramics (UHTCs) and has attracted significantly widespread interest in recent years. …

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 …

This paper analyzes Tantalum Carbide (TaC) and Hafnium Carbide (HfC) for spacecraft material. We show that Tantalum Carbide (TaC) and Hafnium Carbide (HfC) would rise above the TPS materials temperature. The comparison among RCC, HRSI, LRSI, FRSI, and TaC-HfC is on the heat resistant temperature. 2 Analyzing Tantalum Carbide (TaC) …

About Hafnium Carbide. Hafnium Carbide is available in numerous forms and custom shapes including disc, granules, ingot, pellets, pieces, powder, rod, and sputtering target. High purity forms also include Carbide powder, submicron powder and …

In terms of regular compounds rather than alloys, hafnium carbide has the highest melting point, of any compound consisting of just two elements, at just under 3,990 0 C. Moving …

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 Lewis Research Center. The reinforced-plastic nozzles

Hafnium is also used in vacuum tubes as a getter, a material that combines with and removes trace gases from vacuum tubes. Hafnium has been used as an alloying agent in iron, titanium, niobium and other metals. Melting near 3890°C, hafnium carbide (HfC) has the highest melting point of any known two-element compound. Hafnium nitride (HfN) …

South Africa Nigeria metallic Hafnium carbide powder for hard alloy higher hardness tools HfC carbide CAS carbide hafnium carbide powder $1.00-$100.00/ Kilogram 1.0 Kilograms (Min. Order) CN HUNAN HASTION TECHNOLOGY CO., LTD. 4 YRS Contact Supplier 1 / 3 Metal material HfC powder Hafnium Carbide powder …

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 ...

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 ...

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: …

Researchers have discovered that tantalum carbide and hafnium carbide materials can withstand scorching temperatures of nearly 4000 degrees Celsius. These …

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 produce monolithic hafnium carbide (HfC) and tantalum carbide (TaC). The microstructure of HfC and TaC were studied using analytical techniques. The addition of tantalum …

Tantalum carbide (TaC) and hafnium carbide (HfC) are of particular interest due to their high melting temperatures (>4000 K) which are the highest reported among …