Zirconium Tungstate

Zirconium tungstate (Zr(WO4)2) is a metal oxide with unusual properties. The phase formed at ambient pressure by reaction of ZrO2 and WO3 is a metastable cubic phase, which has negative thermal expansion characteristics, namely it shrinks over a wide range of temperatures when heated.[1] In contrast to most other ceramics exhibiting negative CTE (coefficient of thermal expansion), the CTE of ZrW2O8 is isotropic and has a large negative magnitude (average CTE of -7.2x10−6K−1) over a wide range of temperature (-273 °C to 777 °C).[2] A number of other phases are formed at high pressures.

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Spherical tungsten powders

Spherical tungsten powders were synthesized by (RF) argon plasma with irregular tungsten powders. The microstructure and crystallographic phases of the synthesized powders were characterized using scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The results showed that fine spherical powder composed of pure tungsten phase with favorable dispersity and its surface becomes smooth. The spheroidization efficiency of synthesized powders was almost 100 %, and the particle size distribution became narrower after spheroidization treatment. The spheroidization efficiency of the sample decreases gradually as increasing of the feeding rate. The RF plasma spheroidization of tungsten powder is an ideal route synthesis of well- spherical metallic tungsten powders which is widely used in thermal spraying and metal injection moulding process.
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How Carbide Powder is Pressed

Tungsten carbide shapes are made from a powder which is typically tungsten, carbon, cobalt and wax to bind it all together.

Carbide shapes are made three ways; pressing in a die, ”whittling” a shape from a green piece of carbide or grinding a shape from a finished piece of carbide.  See our Carbide Articles Index for more information on Carbide, and the different grades of carbide.

This is a carbide press.  At top is a ram.  The powder is poured into the press cavity (the die) then the ram comes down and compresses the powder.  Once the powder is fully pressed the top ram withdraws.  There is a second ram at the bottom of the cavity that comes up and pushes the part out of the cavity.

Below are two different dies (seen from the top) to press a diamond shape and a trapezoid respectively.   Next to them is a saw tip seen from the side.  Saw tips are pressed from the side.  This means you can use one die to produce many different widths of the same shape.

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Crystalline Tungsten Powder Propertities

Crystalline Tungsten Powder

Main physical properties

Appearance: bright grey with good flowability.

Apparent density (g/cm3): 7.3-8.9

Tap density (g/cm3): 9.0-10.5

FSSS (um): >30;

Screen Size(Mesh): 60~325;

Crystalline Tungsten Powder (Matrix & Spray Powders) have a number of critical uses in today’s world.  Crystalline Tungsten Powder used for infiltration in Mining Bits and other Oil and Gas applications. Crystalline Tungsten Powder is also used in a variety of other applications: lead replacement, golf club weights, show dog ear weights and more.

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Nanostructured Tungsten Oxide

Metal oxides are the key ingredients for the development of many advanced functional materials and smart devices. Nanostructuring has emerged as one of the best tools to unlock their full potential. Tungsten oxides (WO_x) are unique materials that have been rigorously studied for their chromism, photocatalysis, and sensing capabilities. However, they exhibit further important properties and functionalities that have received relatively little attention in the past. This Feature Article presents a general review of nanostructured WO_x, their properties, methods of synthesis, and a description of how they can be used in unique ways for different applications.

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NICKEL TUNGSTATE, NiWo4

This product belongs to MP Biomedicals Rare Chemical library. Most Rare Chemical products are available for immediate delivery and sold "As Is". MP Biomedicals does not collect analytical data for those products. All sales are final. However, analytical test may be performed upon custom request for bulk orders. 

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Tantalum Carbide Powder

Tantalum carbide (TaC) is an extremely hard (Mohs hardness 9-10) refractory ceramic material, commercially used in tool bits for cutting tools. The hardness is only exceeded by diamond. It is a heavy, brown powder usually processed by sintering, and an important cermet material. It is sometimes used as a fine-crystalline additive to tungsten carbide alloys. Tantalum carbide has the distinction of being the stoichiometric binary compound with the highest known melting point, at 4150 K (3880°C). The substoichiometric compound TaC0.89 has a higher melting point, near 4270 K (4000°C). It burns in air with a bright flash and only slightly soluble in acids. Has a metallic luster.


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