{"id":1497,"date":"2023-12-25T03:07:51","date_gmt":"2023-12-25T03:07:51","guid":{"rendered":"https:\/\/am-printing.com\/?p=1497"},"modified":"2023-12-25T03:09:27","modified_gmt":"2023-12-25T03:09:27","slug":"pure-tungsten-powder-20231225","status":"publish","type":"post","link":"https:\/\/am-printing.com\/ko\/pure-tungsten-powder-20231225\/","title":{"rendered":"\uc21c\uc218 \ud145\uc2a4\ud150 \ubd84\ub9d0"},"content":{"rendered":"\n

Overview<\/h2>\n\n\n\n

Pure tungsten powder<\/a> is a fine powder form of elemental tungsten that is often processed into different materials for a variety of commercial and industrial applications. Key details of pure tungsten powder include:<\/p>\n\n\n\n

Chemical formula<\/td>W<\/td><\/tr>
CAS Number<\/td>7440-33-7<\/td><\/tr>
Melting point<\/td>3,422\u00b0C (6,192\u00b0F)<\/td><\/tr>
Density<\/td>19.3 g\/cm3<\/sup><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Tungsten powder is valued for possessing the highest melting point of all metals as well as high density, strength, and corrosion resistance. It is commonly used in applications requiring hardness, wear resistance, durability and heat resistance properties.<\/p>\n\n\n\n

Some key uses of pure tungsten powder include manufacturing tungsten carbide, tungsten heavy alloys, tungsten mill products, lighting filaments, heating elements, radiation shielding and specialty alloys. The powder can be further processed via sintering, hot isostatic pressing, thermal spray coatings and additive manufacturing.<\/p>\n\n\n\n

\"pure<\/figure>\n\n\n\n

Types of Pure Tungsten Powder<\/h2>\n\n\n\n

There are several classifications and grades of pure tungsten powder defined by parameters like particle size, morphology, apparent density, and impurity levels:<\/p>\n\n\n\n

Type<\/td>Description<\/td><\/tr>
Ultrafine powder<\/td>High surface area powder with average particle size under 0.5 microns<\/td><\/tr>
Fine powder<\/td>Average particle size ranging from 0.5 – 10 microns<\/td><\/tr>
Coarse powder<\/td>Particle size above 10 microns<\/td><\/tr>
Nano powder<\/td>At least one dimension less than 0.1 micron<\/td><\/tr>
Spherical powder<\/td>Rounded particle shape and morphology<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

These powders are tailored in size and morphology for specific fabrication processes and to achieve unique material properties in the final part.<\/p>\n\n\n\n

Composition of Pure Tungsten Powder<\/h2>\n\n\n\n

High purity tungsten powders contain over 99.9% elemental tungsten by weight. Impurities may include low levels of carbon, oxygen, nitrogen and other trace elements.<\/p>\n\n\n\n

Constituent<\/td>Weight %<\/td><\/tr>
Tungsten (W)<\/td>99.9% min<\/td><\/tr>
Carbon (C)<\/td>0.06% max<\/td><\/tr>
Oxygen (O)<\/td>0.03 – 0.1%<\/td><\/tr>
Nitrogen (N)<\/td>0.02% max<\/td><\/tr>
Other trace elements<\/td>0.01% max<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Maintaining high purity levels in the starting powder is critical to achieve final material properties like density, strength and ductility in tungsten products. Specific impurity limits may be defined by various tungsten powder grades and specifications.<\/p>\n\n\n\n

Properties of Pure Tungsten Powder<\/a><\/h2>\n\n\n\n

In its pure powder form, tungsten possesses several unique physical and chemical properties:<\/p>\n\n\n\n

Property<\/td>Value<\/td><\/tr>
Melting point<\/td>3,422\u00b0C (6,192\u00b0F)<\/td><\/tr>
Boiling point<\/td>5,930\u00b0C (10,706\u00b0F)<\/td><\/tr>
Density<\/td>19.3 g\/cm3<\/sup><\/td><\/tr>
Electrical resistivity <\/td> 5.5 x 10-6<\/sup> \u03a9cm<\/td><\/tr>
Young’s modulus<\/td>411 GPa (59,700 ksi)<\/td><\/tr>
Poisson’s ratio <\/td>0.28<\/td><\/tr>
Coefficient of thermal expansion<\/td>4.5 x 10-6<\/sup>\/K <\/td><\/tr>
Oxidation resistance<\/td>Resists oxidation in air up to 600-800\u00b0C<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

These intrinsic properties are maintained as the powder is converted into other tungsten materials like heavy alloys, mill products, or composites using various powder metallurgy techniques.<\/p>\n\n\n