Tungsten Alloy Injection Molding Technology Binder Removal Process
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- Category: Tungsten Information
- Published on Monday, 16 September 2013 14:09
- Hits: 2065
Injection molded preform by a large amount of organic binder and the powder is composed of a polymer, an organic binder of the powder body from the bonding role in ensuring the injection molded preform having a sufficient strength, however, these bonding agents must be completely removed before sintering (i.e. skim process), otherwise it will affect the alloy properties.
Skim is the use of physical and chemical methods of injection molded preform dissolved organic binder and forming blanks from cracking thus removing process. Degreasing before sintering is a very important process. By injection of the feed pressure of the large number of preform binder (i.e., organic polymer), the volume ratio of 40070 to 60%, and sintering the binder must be removed prior to, or, in the sintering, these organic polymers degradation and thermal decomposition can occur, producing many gases generated in large compacts internal pressure, so that cracking and porosity compacts. Binder removal requires several steps, PIM process manufacturing costs to a large extent controlled by this stage. Binder in the form of a liquid or gas to escape from the inside surface of the sample in turn, form a connected open pores, adhesive removal speed, while no dirty degreasing blanks, and has no distortion.
Non-fat will be successful bubbling, cracking, peeling, holes, cracks, dirty technology and deformation and other defects. Main causes of skim rate is too fast, improper bonding mode selection, removal of the temperature control is inappropriate, improper control of the heating rate. Degreasing the defects affect the subsequent sintering, skim defects generated by a stop to make the sintering step, degreasing defects generated significantly affect the properties of the alloy.
Degreasing Methods: divided into thermal degreasing degreasing, solvent degreasing, catalytic skimmed, skimmed siphon of four.
Thermal Degreasing: Thermal degreasing injection molded preform is embedded in the alumina powder filler material in a vacuum, oxidizing or reducing atmosphere under heating according to a certain process.
Solvent Degreasing: degreasing solvent injection molded preform is immersed in a low molecular weight organic solvent or inorganic solvent (or solvent vapor), the use of organic molecules similar to the principle of compatibility.
Catalytic Skim: catalytic catalytic skim skim also known as BASF, which skimmed way linked with BASF binder.
Siphon Degreasing: degreasing siphon injection molded preform is buried in the micron, sub-micron powder, alumina powder, or other fillers, the use of fine powder of the molded preform by capillary action of the organic binder in the process of the gradual discharge.
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Cemented Carbide is one of the most successful composite engineering materials
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- Category: Tungsten Information
- Published on Friday, 13 September 2013 18:49
- Hits: 1814
Cemented Carbide is one of the most successful composite engineering materials ever produced. Its unique combination of strength, hardness and toughness satisfies the most demanding applications.
Tungsten carbide is an equal mixture of tungsten and carbon. When the alloy is created, it is typically made as a fine gray powder. This powder is compressed into the desired shape using a modified die-casting process. After hardening into its new shape, this material is extremely hard and can withstand heat that would melt other metals.
The most valuable property of Cemented Carbide is that it offers a safer and more dependable solution than any other known material to one of the toughest problems engineers contend with - reliability. Learn all about Cemented Carbide!
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How is Cemented Carbide made?
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- Category: Tungsten Information
- Published on Friday, 13 September 2013 18:45
- Hits: 1912
The manufacturing process begins with the composition of a specific tungsten carbide powder mixture - tailored for the application.
The tungsten carbide powder is compacted into a form.
In a high-temperature sintering furnace, the tungsten carbide structure of the blank is shaped at precise temperatures for strictly defined periods. During this heat treatment, the tungsten carbide blank undergoes shrinkage of some 50% in volume.
The sintered Cemented Carbide component gains its final finish by additional grinding, lapping and/or polishing processes.
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The actual definition of Carbide bit
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- Category: Tungsten Information
- Published on Friday, 13 September 2013 18:47
- Hits: 1968
The actual definition of a tool bit is a matter of some debate. In some circles, a bit is a non-rotary cutting tool like the blade on a lathe or the head on a shaping machine. In other places, it is any removable or exchangeable tool piece, such as the drill part of a handheld drill. Both definitions have one thing in common—the bit is the part that directly interacts with the worked material, and any changes to the material are done by the bit alone.
Manufacturers use a carbide bit when the material or manufacturing process requires high tolerances or precision. These bits are often used when a material is hard enough that a typical bit won’t work it properly, such as with hardened or carbon steel. Since that’s what a common bit is made of, it isn’t hard enough to work the material. Interaction between two pieces of the same material typically results in both parts being ruined.
Another common reason for a carbide bit is when the material being worked needs exposure to very high temperatures either before or during the process. Since a carbide bit can withstand greater temperatures than steel, it is often used in high-heat situations. This is also true when the friction created by the working process would create enough heat to melt a steel bit, such as in high-speed grinding.
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How is Cemented Carbide made?
- Details
- Category: Tungsten Information
- Published on Friday, 13 September 2013 18:45
- Hits: 1816
The manufacturing process begins with the composition of a specific tungsten carbide powder mixture - tailored for the application.
The tungsten carbide powder is compacted into a form.
In a high-temperature sintering furnace, the tungsten carbide structure of the blank is shaped at precise temperatures for strictly defined periods. During this heat treatment, the tungsten carbide blank undergoes shrinkage of some 50% in volume.
The sintered Cemented Carbide component gains its final finish by additional grinding, lapping and/or polishing processes.
Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
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