Industry Applications of Tungsten Polymer

Details
Category: Tungsten Information
Published on Friday, 17 July 2015 14:05
Written by wenjing
Hits: 376
  • Print

tungsten polymer is composed of tungsten powder and one of a number of standard plastic base resins, which are selected according to the application. These base resin systems include polysulfones (PSU), co-polyamides, polyamides (PA), polymethylpentenes (PMP), polyurethanes (TPU), acryloynitrile butadiene styrene (ABS), polyethylenes (PE) and polyetheretherketones (PEEK). It has a high molecular polymer composited material having a density up to 11 g/cc (equivalent to lead). It is composed of the following components by weight ratio: a high molecular polymer 20-100, tungsten powder 950-1000, tungsten fiber 0-50, a coupling agent 0.5-5 and other aids 0.5-10.

Tungsten polymer has been found many applications in industries, including:

  • X-ray devices in manufacturing industries and medical x-ray machines;
  • Nuclear and medical industries, it is used as radiation shielding;
  • Radiation shielding and radiation-protective equipment;
  • Gamma ray shielding material and substitute for lead fiber mat in nuclear reactor piping systems;
  • It is also used in weight and balance applications as a counterweight for applications like motors, ballasts and more;
  • Used as a sound proofing material in aviation headphones;
  • Acts as a damper to reduce shock due to vibration in the automotive industry.

tungsten polymer

 

  Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online- http://www.tungsten-alloy.com
  Tel.: 86 592 5129696; Fax: 86 592 5129797
  Email:  sales@chinatungsten.com
  Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
  Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
  Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn
 

Low-temperature Structural Properties of Calcium Tungstate and Calcium Molybdate-III

Details
Category: Tungsten Information
Published on Thursday, 16 July 2015 18:04
Written by xinyi
Hits: 324
  • Print
To address the problem of material characterisation we used computation techniques and recently it was demonstrated that quasi-harmonic lattice dynamics and the lattice energy minimisation technique are viable tools for the characterisation of lattice dynamics of calcium tungstate. The lattice dynamics simulations were performed using the software code GULP; the energy was constructed from empirical interaction potentials. The success of this approach stimulated our interest in the modelling of lattice dynamics of other materials, specifically CaMoO4. 
 
Thermodynamic properties and lattice dynamics of calcium molybdate have been investigated using self-consistent semi-classical simulations based on the quasiharmonic approximation and free energy minimisation. Comparing with the previously reported simulations of lattice dynamics in CaWO4 the model was improved by defining the intermolecular forces that are responsible for the interaction between complex anions MoO4 −2 . The validity of the models and simulations undertaken was verified where possible by comparing the number of calculated parameters of the crystal under investigation with those measured in experiments at HASYLAB and it was shown that there is reasonable agreement between them. Based on the improved model of interactions the thermal dependencies of isothermal bulk and shear elastic modules, heat capacity, entropy S, thermal expansion and Grüneisen parameter, as well as phonon density of states were calculated and analysed.


Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

 

Low-temperature Structural Properties of Calcium Tungstate and Calcium Molybdate-II

Details
Category: Tungsten Information
Published on Thursday, 16 July 2015 17:53
Written by xinyi
Hits: 355
  • Print
At room temperature CaWO4 and CaMoO4 echibit scheelite structure, having a complex layer structure with the layers being perpendicular to the c-axis. Each layer has a two-dimensional CsCl type arrangement of a Ca cation and complex anion WO4 –2 or MoO4 –2, which are surrounded by eight ions of opposite charge. Our studies reveal a scheelite type of structure in the whole temperature region investigated (5 – 300 K for CaWO4 and 12 – 300 K for CaMoO4). No structural anomalies have been observed. 
 
The lattice parameters increase nonlinearly with temperature (see Figs. 1 and 2). There is a pronounced anisotropy of thermal expansion in CaWO4 and CaMoO4: the thermal expansion in the [100] direction is about 50 % of that in the [001] direction of the tetragonal cell. Thermal dependences of the lattice parameters obtained using synchrotron radiation agree well with the respective ones from elastic neutron scattering and links fairly well to the high-temperature data.




Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

 

Defect Types of Tungsten Contacts- I

Details
Category: Tungsten Information
Published on Thursday, 16 July 2015 18:02
Written by Yahong
Hits: 333
  • Print

Defect types of tungsten contacts described as follows:

1. Porous holes, pores
This defect type is common in powder metallurgy to prepare tungsten contacts. This may be because:
Uneven particle size of tungsten powder;
The gas content of tungsten powder is relatively large;
Insufficient pressure when mixing powder;
Insufficient infiltration, when you are sintering the porous tungsten skeleton.

2. Unevenly distributed organization
Reason: Because of the existence of added element, it makes the added element or poor oxide in grain boundaries aggregated.

3. Inclusions
Under normal circumstances, the presence of inclusions in the tungsten contacts may be due to: non-metallic inclusions mixed in them and other foreign metal inclusions mixed with.

4. Bubbles
Because there are small holes in tungsten ingot itself, and the phenomenon of inner oxide will appear when pressing, crushed holes will expand to form bubbles.

5. Delaminating cracks
Because tungsten ingot itself has already gathered micro cracks, during the oxidation process, because stress makes delaminating of the cracks.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: sales@chinatungsten.com
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Low-temperature Structural Properties of Calcium Tungstate and Calcium Molybdate-I

Details
Category: Tungsten Information
Published on Thursday, 16 July 2015 17:36
Written by xinyi
Hits: 324
  • Print
The use of a material as CPSD relies on the efficiency of the process of phonon transport through the crystal. Therefore, knowledge of lattice dynamics of the crystal is of great importance. So far there is lack of information on the above properties not only for the prospective materials, but even for well-known scintillation materials when low-temperature applications are considered. In order to resolve this problem this study turned our attention to modelling techniques and the precise determination of structural parameters at different temperatures.
 
The thermal behaviour of structure was studied using the high-resolution powder diffraction technique and synchrotron radiation. The experiments were carried out at the beamline B2 on high resolution powder diffractometer equipped with a closed-cycle helium cryostat. All measurements were performed in DebyeScherer geometry (0.3 mm capillaries) using the Image Plate detector OBI and X-ray wavelength of 0.4996 Å. The measurements were carried out in the temperature range 12 – 300 K. First, the sample was cooled from room temperature to 12 K and a set of diffraction patterns (37 for CaMoO4 and 16 for CaWO4) in the 2θ region 2 – 40o was collected during cooling. The temperature was then stabilised at 12 K and another set of powder diffraction patterns was collected in the temperature range 20 - 300 K with temperature increments of 20 K. The measured XRD data where analysed using the full profile Rietveld method implemented in the WinCSD program package. Additionally, neutron scattering experiments were performed at the D2b instrument (ILL) for calcium tungstate.


Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

 

More Articles...

  1. History of Professional Darts CorporationⅡ
  2. History of Professional Darts CorporationⅠ
  3. Ammonium Paratungstate Preparing Submicron Spherical Tungsten Powder Process
  4. Scheelite and the Synthetics
 

WeChat

Address: 3F, No.25-1 WH Rd., Xiamen Software Park Ⅱ, FJ 361008,China
Phone:+86-592-5129696,+86-592-5129595; Email: sales@chinatungsten.com
Certified by MIIT:闽B2-20090025　闽ICP备05002525号-1　 闽公网安备 35020602000140号 Copyright © 2025 Chinatungsten Online. All Rights Reserved.