Vacuum deposition is a family of processes used to deposit layers of material atom-by-atom or molecule-by-molecule on a solid surface. The deposited layers can range from a thickness of one atom up to millimeters, forming freestanding structures.  It is widely used in metallic films, transparent conductive oxides (TCO), superconducting films & coatings. Multiple layers of different materials can be used, for example to form optical coatings. When the vapor source is a liquid or solid the process is called physical vapor deposition (PVD). Vacuum metallization is a process that creates a unique quality finish used in the manufacture of products worldwide When the source is a chemical vapor precursor the process is called chemical vapor deposition (CVD). Often a combination of PVD and CVD processes are used in the same or connected processing chambers.

The points of operation of shelve-on and shelve-off:

1. Check up the base oil quality before the shelve-on, if it is unqualified, it should be cleaned and hen re-oiling.
2. Clamp must be stable to ensure that injection mold parts do not fall when rotating vacuum chamber.
3. Loading and hanging position of injection mold parts would have marks after plating. In addition, if the clamping force is too large injection mold parts may be deformed, so operators can the inlet / runner as loading and hanging position, and then remove it after the plating.
4. In the process of shelve-on, operators should not touch the valid trial of injection mold parts, avoid leaving fingerprints smudges to impact plating effect.  
5. Cage should keep clean, and it needs a good scrub regularly.
6. Operators should carefully remove the injection mold part, and it should not be scratched.
7. Interlayer should be padded with a clean paper.
8. Plastic pots should be covered well to avoid dust.

In part 7 we know that rose reamer is secondarily used as softening tungsten carbide reamer and tapered reamer is used to make a tapered hole so that a tapered pin can be fixed in.And here we explain shell reamer and more taper reamer which are all tungsten carbide reamers.

(To be continued. This article is divided into several parts and this is part 8， for part 7please refer to http://news.chinatungsten.com/en/tungsten-information/79631-ti-10179)

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The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies.

1. The following AWS standard (AWS standards are published by the American Welding Society, 550N.W.LeJeune Road, Miami, FL 33126) is referenced in the mandatory sections of this document:

AWS A5.01M/A5.01 (ISO 14344 MOD), Procurement Guidelines for Consumables – Welding and Allied Processes – Flux and Gas Shielded Electrical Welding Processes

2. The following ANSI standard (The ANSI standard is published by American Welding Society, 550N.W.LeJeune Road, Miami, FL 33126) is referenced in the mandatory sections of this document:

ANSI Z49.1, Safety in Welding, Cutting, and Allied Processes

3. The following ASTM standards (ASTM standards are published by the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428 - 2959) are referenced in the mandatory sections of this document:

ASTM E 29, Standard Practice for using Significant Digits in Test Data to Determine Conformance with Specifications

ASTM F 288, Standard Specification for Tungsten Wire for Electron Devices and Lamps

4. The following ISO standard (ISO standards are published by the International Organization for Standardization) is referenced in the mandatory sections of this document:

ISO 31 – 0:1922, Quantities and Units – Part 0: General principles; and Annex B, Rule A

 

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Promote the reform of enterprises and develop tungsten industry

The private and shareholding enterprises prospect in Ganzhou, whose production occupied 80% of that in the whole tungsten metallurgy and processing industry. There are Chongyi Zhangyuan Tungsten Co., Ltd. whose business covers mining, dressing, metallurgy, down stream products processing, research and development, import and export; Ganzhou Tejing Tungsten and Molybdenum Company which cooperated with the stock listed company of Tianjin Tejing Material Co., Ltd.; Ganxian Shirui Mineral Co., Ltd. which cooperated with foreign companies to do mining in the other province and even abroad; Jiangxi Yaosheng Industry and Trade Co., Ltd. which based on the resources to extend the down stream products processing. These companies are vivid with much more potential of development and find their own position in Chinese tungsten industry as well as become the leading force of Ganzhou tungsten industry.

As an outstanding representative, Mr. Huang Zelan, the president of Chongyi Zhangyuan Tungsten Co., Ltd., was elected as a national model. 

 

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Adopt solid phase sintering method to prepare Ag-WC-C contacts (Material: silver powder, plate-like grains of tungsten carbide and graphite powder), wherein milling method can be chemical coating powder method.
Preparation process:
1. According to percentage of their content to weigh silver powder, tungsten carbide powder, graphite powder and metal additive powder, such as cobalt (Co), nickel (Ni) or zirconium (Zr). Among which,
Silver accounts for 84-85%; tungsten carbide powder of 12%; graphite powder of 3%; metal additive powder accounting for 0-1%.
Use stainless steel wire mesh to sieve the above-mentioned materials, and then pour them into a blender after mixing.
2. The preparation of silver nitrate solution. Silver should be fully dissolved in concentrated nitric acid.
3. The prepared silver nitrate solution is poured into the reaction vessel, then, complex it with ammonia, until the PH value rise to 10. Then adding the mixing powder to reaction vessel and stirring.
4. Continue stirring, use atomization device to add the reducing agent hydrazine hydrate to the reaction vessel in liquid spray-way until the reaction is sufficient.
Hydrazine hydrate, a colorless transparent oily liquid owns strong basicity and strong reducibility, which can act as a reducing agent and an antioxidant.
5. Washing the mixing powder with distilled water after processing by the above steps until it is neutral, then dry it in a dryer, the temperature is controlled at 90 ℃, dry mixing powder of silver coating can be available.
6. Pressing the dry mixing powder of silver coating (cold pressing), to form its shape, then, sintering it in a sintering furnace, in hydrogen atmosphere, temperature of 750-890 ℃, sintering time of 3-5h, and then re-pressing at a pressure of 10-20T / Cm2 and, ultimately, Ag-WC12-C3 contacts is prepared.



 

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