Tungsten Crucible - The Use of Crucible in lab
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- Category: Tungsten Information
- Published on Tuesday, 09 June 2015 18:38
- Written by Yahong
- Hits: 451
Tungsten crucible is a vessel or melting pot, whose shape is similar to the pot or cup, which is also a kind of crucible and is made of extremely refractory material (such as graphite, quartz, clay, china clay or compare refractory metal, etc.) .
Crucible is a bowl-shaped vessel, which has a ceramic-like deep bottom. The following is something about the use of crucible in lab. Because crucible’s high temperature resistance performance is better than glass crucibles’, so when there is a solid requires heating or melting, we must use it. When using a crucible, in order to prevent heat objects bounces or melting liquid spills, a crucible cover is usually needed to diagonally cover on the crucible, to allow air to have a freely access and for possible oxidation reactions. Because the bottom of the crucible is very small, generally you need to put it on the pipeclay triangle and then directly heat it. Crucible can be positively or obliquely put on the pipeclay triangle, according to the requirements. After heating, the tungsten crucible should not immediately be placed on a cold metal table, to prevent it from being broken due to the rapid cooling.
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Effective Treatment of Tungsten Multileaf Collimator
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- Category: Tungsten Information
- Published on Tuesday, 09 June 2015 18:29
- Written by wenjing
- Hits: 399
Due to tungsten alloy has excellent radiation attenuation properties, with thinner thickness but high effective in blocking harmful X-ray and gamma radiation, , it is widely used in multileaf collimator. During radiotherapy, tungsten multileaf collimator are delivered while the gantry rotates around the patient. The intensity of the radiation is modulated and the shape of the beam is dynamically adjusted by moving the tungsten alloy leaves. The gantry speed and dose rates may also be changed during the rotation. This provides the potential to create effective treatment that are high standard with a shorter treatment time.
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Tungsten Carbide Cutting Tools Chipping Reasons
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- Category: Tungsten Information
- Published on Tuesday, 09 June 2015 16:36
- Written by limei
- Hits: 444
Master tungsten carbide cutting tools chipping reasons is helpful to take appropriate measures to address chipping problems of tungsten carbide cutting tools, tungsten carbide cutting tools chipping reasons reflect in five aspects.
1. Poor choice of tungsten carbide cutting tools grade, specification.
2. The geometry of the inappropriate choice of tungsten carbide cutting tools (such as front and rear angle is too large, etc.).
3. Incorrect welding process of tungsten carbide cutting tools, resulting in excessive stress welding or welding cracks.
4. Unreasonable selection of tungsten carbide cutting tools. Such as excessive, machine tools boring car; intermittent cutting, high cutting speed; when blank margin uneven, the depth of cut is too small
5.Insufficient coolant flow or incorrect filling method which results in tungsten carbide cutting tools damage.
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Tungsten Multiple Layer Multileaf Collimator
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- Category: Tungsten Information
- Published on Tuesday, 09 June 2015 18:27
- Written by wenjing
- Hits: 426
Tungsten multiple layer multileaf collimator for shaping radiation beam. The collimator comprises first and second layers of a plurality of elongated radiation blocking tungsten alloy leaves. The leaves of each layer are arranged adjacent one another so as to form two opposed rows of adjacently positioned tungsten alloy leaves and are movable in a longitudinal direction which is generally traverse to the direction of the beam so as to define a radiation beam shaping field between the opposed ends of tungsten alloy leaves. The layers are arranged one above another in the beam direction and offset in a lateral direction generally transverse to the beam direction and orthogonal to the longitudinal direction so that spaces between adjacent tungsten alloy leaves of the first and second layers are positioned over and under, respectively, tungsten alloy leaves of the second and first layers, respectively.
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Tungsten Carbide Cutting Tools Grinding Features
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- Category: Tungsten Information
- Published on Tuesday, 09 June 2015 16:36
- Written by limei
- Hits: 403
Tungsten carbide cutting tools inherited high hardness, brittleness, thermal conductivity and other characteristics of tungsten carbide materials, making tungsten carbide cutting tools grinding have great difficulty. Tungsten carbide cutting tools grinding features can be concluded in two aspects.
First, tungsten carbide cutting tools grinding features reflects in that tungsten carbide cutting tools grinding process requires a better self-grind resistance and good cooling, so as to reduce the production of grinding cracks.
Second, tungsten carbide cutting tools grinding features reflects in that diamond grinding wheels are widely used in tungsten carbide cutting tools grinding due to high grinding efficiency, small grinding force, easy to passivation and lower local temperature grinding surface contact area ( generally at 400 ℃ for around), etc.. But in the diamond grinding wheel process of tungsten carbide cutting tools, due to large grinding allowance, processing methods, diamond tools and grinding systems feature if choose unproperly, will result in instantaneous temperature of tool grinding surface is too high , resulting in grinding cracks.
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