Niobium carbide WikiMili, The Free Encyclopedia

Niobium carbide (NbC and Nb2C) is an extremely hard refractory ceramic material, commercially used in tool bits for cutting tools. It is usually processed by sintering and is a frequent additive as grain growth inhibitor in cemented carbides. It has the appearance of a browngray metallic powder wit

Hafnium Fisher Scientific

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Hunan Huawei Jingcheng Material Technology Co., Ltd.

Hunan HuaWei Aerospace Special Materials Co., Ltd., loed in the Yuelu Mountain National Science and Technology Park, is engaged in the R & D, manufacturing and appliion of titanium, zirconium, hafnium, rare earth materials and its binary compound or polycompound (carbide, nitride, silicide, boride, sulfide) and other nano, subnano ceramic powder and related products.

Microstructure and mechanical properties of hafnium

Hafnium carbide coating has high hardness, excellent wear resistance, good resistance to corrosion, and low thermal conductivity, which are ideal characteristics for use in hightemperature appliions. (6) However, until now scant researchers concentrated on HfC coatings. It was reported by Ferro et al. (7) that the hardness of pulsed laser

Hafnium carbide nanocrystal chains for field emitters

A hafnium carbide (HfC) nanostructure, i.e., HfC nanocrystal chain, was synthesized by a chemical vapor deposition (CVD) method. Xray diffractometer, fieldemission scanning electron microscope, transmission electron microscope, and energydispersive Xray spectrometer were employed to characterize the product.

Hafnium carbide nanocrystal chains for field emitters

Jun 30, 2014 · Read "Hafnium carbide nanocrystal chains for field emitters, Applied Surface Science" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publiions available at your fingertips.

Zirconium carbide Wikipedia

Hafniumfree zirconium carbide and niobium carbide can be used as refractory coatings in nuclear reactors. Because of a low neutron absorption crosssection and weak damage sensitivity under irradiation, it finds use as the coating of uranium dioxide and thorium dioxide particles of nuclear fuel.

Tensile Behavior of Tungsten and TungstenAlloy Wires to

Tensile Behavior of Tungsten and TungstenAlloy Wires from 1300 to 1600 K OBSATMIO 1426) TENSILE BEHAVIOR OF TUNGSTEN AND TUNGSTENALLOY WIRES FROM 1300 TO 1600 K (ST300W), and tungsten + 0.4 a/o hafnium carbide (WHfC) wires was determined over the temperature range 1300 to 1600 K at strain rates of 3.3~10~ to 3.3~105 secl

Cathode Guide APTech

Review APTech''s Cathode Guide to find the different combinations of custom hodes that Applied Physics Technologies is capable of producing.

tantalum hafnium carbide, tantalum hafnium carbide

A wide variety of tantalum hafnium carbide options are available to you, There are 57 suppliers who sells tantalum hafnium carbide on Alibaba , mainly loed in Asia. The top countries of supplier is China, from which the percentage of tantalum hafnium carbide supply is respectively.

Catalyst‐Assisted Growth of Single‐Crystalline Hafnium

Jan 01, 2014 · Read "Catalyst‐Assisted Growth of Single‐Crystalline Hafnium Carbide Nanotubes by Chemical Vapor Deposition, Journal of the American Ceramic Society" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publiions available at

hafnium carbide 2014 faradawn

hafnium carbide 2014. Hafnium carbide (Hf C) is a chemical compound of hafnium and a melting point of about 3900 °C it is one of the most refractory binary compounds known. However, it has a low oxidation resistance, with the oxidation starting at temperatures as low as 430 °C.

Hafnium(IV) carbide CAS No. 12069851 SigmaAldrich

Hafnium(IV) carbide <1.25 μm particle size CAS Number 12069851. Linear Formula HfC . Molecular Weight 190.50 . EC Number 2351141. MDL number MFCD00016126. PubChem Substance ID 24881525. NACRES NA.22

poem Hafnium, a Periodic Table poem By Chicago Poet Janet

Hafnium carbide has the highest melting point of just two elements (and a Tungsten carbide with Hafnium has the highest melting point). But it''s scarcity makes Hafnium expensive because I heard that nuclear power plants can pay a million dollars just for the neutron absorbing Hafnium rods. So I guess it would make sense why scientists

Hafnium Carbide Market 2020 – Global Industry Analysis

Feb 11, 2020 · To Analyze Hafnium Carbide Consumption (Value and Volume), Product Type And Appliion, History Data From 2014 To 2019, And Hafnium Carbide market Forecast To 2026.

Synthesis and Characterization of Hafnium Carbide Based

Hafnium carbide powder was synthesized by solgel polycondensation of hafnium chloride with citric acid. The starting materials were dissolved in water and mixed homogeneously on a hot plate until

Hafnium Carbide Powder HfC cas 12069851graphene

Hafnium carbide powder is obtained by the reduction of hafnium(IV) oxide with carbon at 1800 to 2000 °C. A long processing time is required to remove all oxygen. Alternatively, highpurity HfC coatings can be obtained by chemical vapor deposition from a gas mixture of methane, hydrogen, and vaporized hafnium(IV) chloride.

Refractory Wikipedia

Hafnium carbide is the most refractory binary compound known, with a melting point of 3890 °C. The ternary compound tantalum hafnium carbide has one of the highest melting points of all known compounds (4215 °C). Uses. Refractory materials are useful for the following functions: Serving as a thermal barrier between a hot medium and the wall

Lowtemperature Rapid Synthesis of Ultrafine Hafnium

Jul 12, 2018 · Nano hafnium carbide (HfC) powders were synthesized by solgel combining hightemperature rapid heat treatment process using citric acid and hafnium tetrachloride as the raw materials. The effects of ball milling treatment on the phase and morphology of pyrolysis products (HfO2C) and final HfC product were investigated and the influences of heat treatment temperature and

Mechanochemical Synthesis of Hafnium Carbide using

The paper presents the results of studying mechanochemical synthesis of hafnium carbide in the process of vibration treatment of the mixture of powders of hafnium and amorphous carbon obtained by pyrolytic processing of plant materials. Phase compositions, morphology, as well as fractional and chemical compositions of the synthesized products were studied. It has been found that the use of

Anthrosphere Scientific Student

Oct 05, 2014 · Earth''s crust acts as a barrier to lock the heat inside — a useful function, because the temperatures in the centre of the Earth may be up to 7,000 degrees Kelvin (6,700 degrees Celsius), hot enough to melt carbon – the element with the highest MP (~4,500 degrees Kelvin) – and tantalum hafnium carbide – the compound with the highest

Hafnium Hf (Element) PubChem

Hafnium has been successfully alloyed with iron, titanium, niobium, tantalum, and other metals. Hafnium carbide is the most refractory binary composition known, and the nitride is the most refractory of all known metal nitrides (m.p. 3310C). At 700 degrees C hafnium rapidly absorbs hydrogen to form the composition HfH1.86.

Ferroelectric HfO2based materials for nextgeneration

Ferroelectric HfO 2based materials for nextgeneration ferroelectric memories. Zhen Fan T. Mikolajick, J. Müller and P. Polakowski, Nextgeneration ferroelectric memories based on FEHfO 2, ISAF/ISIF/PFM, 2015 Joint IEEE Int Some properties of hafnium oxide, hafnium silie, calcium hafnate, and hafnium carbide, J. Am

Tantalum hafnium carbide Wikipedia

Tantalum hafnium carbide is a refractory chemical compound with a general formula Ta x Hf yx C y, which can be considered as a solid solution of tantalum carbide and hafnium carbide. Individually, these two carbides have the highest melting points among the binary compounds, 4,150 K (3,880 °C

LowTemperature Preparation of Single Crystal Titanium

The synthesis of single crystal titanium carbide (TiC) nanofibers has been investigated by the reaction of carbon sources of various sizes and microstructures with an equimolar mixture of titanium dioxide (TiO2) and titanium metal powders, in a molten salt medium. The carbon sources included carbon lamp black, thermal carbon black, pyrolytic carbon black, and multiwalled carbon nanotubes

A Medley of Potpourri: Hafnium

Hafnium carbide is the most refractory binary compound known, with a melting point over 3890 °C, and hafnium nitride is the most refractory of all known metal nitrides, with a melting point of 3310 °C. This has led to proposals that hafnium or its carbides might be useful as construction materials that are subjected to very high temperatures.

Thermal Conductivity of Uranium Nitride and Carbide

We investigate the electronic thermal conductivity of alternative fuels like uranium nitride and uranium carbide. We evaluate the electronic contribution to the thermal conductivity, by combining firstprinciples quantummechanical calculations with semiclassical correlations. The electronic structure of UN and UC was calculated using Quantum Espresso code. The spin polarized calculations were

Hafnium Element information, properties and uses

Hafnium is also very good at forming superalloys, which can withstand very high temperatures and has found appliions in making a variety of parts for space vehicles. 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

Rediscovered ceramic Hafnium Carbide can withstand

Sep 17, 2014 · Rediscovered ceramic Hafnium Carbide can withstand temperatures three times hotter than lava at 4050 celsius and could help enable hypersonic planes. Rediscovered ceramic Hafnium Carbide can withstand temperatures three times hotter than lava at 4050 celsius and could help enable hypersonic planes.

Synthesis of polymeric precursors for refractory carbides

Dec 01, 2014 · Hafnium Carbide and diboride are ceramics with ultrahigh melting temperatures representing the upper end of refractory materials. Current standard syntheses of these ceramics form powders in an energy intensive carbo (boro) thermal reduction or coatings via vapor deposition, a time consuming process requiring high vacuum conditions.

Carbides and Nitrides of Zirconium and Hafnium

Among transition metal carbides and nitrides, zirconium, and hafnium compounds are the most stable and have the highest melting temperatures. Here we review published data on phases and phase equilibria in HfZrCNO system, from experiment and ab initio computations with focus on rocksalt Zr and Hf carbides and nitrides, their solid solutions and oxygen solubility limits. The systematic

Hafnium(IV) carbide Wikipedia

Hafnium carbide (Hf C) is a chemical compound of hafnium and carbon.With a melting point of about 3900 °C it is one of the most refractory binary compounds known. However, it has a low oxidation resistance, with the oxidation starting at temperatures as low as 430 °C.

Catalyst‐Assisted Growth of Single‐Crystalline Hafnium

Single‐crystalline hafnium carbide (HfC) nanotubes were synthesized by a one‐step alyst‐assisted chemical vapor deposition (CVD) method. The typical nanotubes had uniform diameters of ~60 nm and wall thicknesses of ~15 nm and preferentially grew along [201].

20 Interesting Facts About Hafnium Brian D. Colwell

May 29, 2019 · The abundance of hafnium in our solar system is 1 part per billion by weight. Hafnium carbide (HfC) has the highest melting point of any known twoelement compound at nearly 7,034 degrees Fahrenheit, or 3,890 degrees Celsius. Hafnium is pyrophoric, meaning that it ignites spontaneously, in powder form.

Rediscovered ceramic has potential in hypersonic flight

Oct 16, 2014 · 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.'''' In April 2014

mp21075: HfC (cubic, Fm3m, 225) The Materials Project

HfC is Halite, Rock Salt structured and crystallizes in the cubic Fm3m space group. The structure is threedimensional. Hf4+ is bonded to six equivalent C4 atoms to form a mixture of corner and edgesharing HfC6 octahedra. The cornersharing octahedral tilt angles are 0°. All Hf–C bond lengths are 2.33 Å. C4 is bonded to six equivalent Hf4+ atoms to form a mixture of corner and edge

Attosecond physics phenomena at nanometric tips IOPscience

For example, recent investigations employed molybdenum nanotip arrays (Mustonen et al 2011), gold nanorod arrays (Dombi et al 2013), pillar arrays (Nagel et al 2013) and junction devices (Rybka et al 2016), silver tips (Bionta et al 2016), doped silicon tip arrays (Swanwick et al 2014), hafnium carbide nanotips (Kealhofer et al 2012) and carbon

Hafnium Tube, Hafnium Tube Suppliers and Manufacturers at

Alibaba offers 142 hafnium tube products. About 33% of these are other metals & metal products. 2014 05 ti zr hf ta nb v cr tic w tungsten zirconium hafnium tantalum niobium vanadium chromium titanium carbide powder 3D Print . Hafnium and Hf sputtering target We can produce kinds of metal target according to our customers

Catalyst‐Assisted Growth of Single‐Crystalline Hafnium

Dec 13, 2013 · Single‐crystalline hafnium carbide (HfC) nanotubes were synthesized by a one‐step alyst‐assisted chemical vapor deposition (CVD) method. The typical nanotubes had uniform diameters of ~60 nm and wall thicknesses of ~15 nm and preferentially grew along [201].