Short of Rhenium for Flight Engine Blade in China
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- Category: Tungsten's News
- Published on Wednesday, 30 November 2016 16:03
- Written by pure-tungsten
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The technology of flight research and development has caught up with developed countries, but there has been big problem for the short of raw materials, which are mainly in rare earth metals with high performances, such as rhenium.
Rhenium is a metal with melting point of 3,180℃, similar to tungsten, which is 3,308℃.
Rhenium owns good physical and chemical performances, which results to a wide application in heat resistance parts in aerospace. One of the main use is as additive of 3% ~ 7% in flight engine Ni-based single crystal blade for its deformation and cracking resistance.
Engine Blade
Engine schematic
Engine 3D view
The reserve of rhenium all over the world is really rare with a whole quantity of proven quantity of 2,500tons and whole resource of 7,300~10,300 tons. But it is reported as only 237tons in China by Kunming Institute of Precious Metals.
Rhenium is significant and necessary metal in the development of flight engine, but its shortage has been some restriction for the research. Importing Re or finding alternative metals have been a new research for Chinese aerospace development.
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AH4 Ultra-light Howitzer’s Response Accuracy Superior Than American
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- Category: Tungsten's News
- Published on Friday, 25 November 2016 21:56
- Written by TungstenAlloy
- Hits: 2307
In the 11th Aerospace Expo held in Zhuhai on Nov. 1st, AH4 155 mm ultra-light howitzer was displayed in the indoor Weapons Museum.
Read more: AH4 Ultra-light Howitzer’s Response Accuracy Superior Than American
Electric Operated Tungsten Carbide Dental Drill Market
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- Category: Tungsten's News
- Published on Wednesday, 23 November 2016 11:44
- Written by tang
- Hits: 969
Tungsten carbide dental drill is available in various designs. Tungsten carbide dental drill is basically composed of an air turbine, a hand-piece and tungsten carbide drill bit. Hand piece is a tube shaped slender connecting drill bit with the driving motor. Drill bit is the essential part of tungsten carbide dental drill. Tungsten carbide dental drills are constructed from a variety of raw materials such as metals and polymers. The most advance hand piece is made with titanium. Electric operated tungsten carbide dental drill generate large amount of heat. It performs cutting action smoothly. Tungsten carbide dental drill is frequently used by dentists and dental practitioners for treating cavities in diseases such as dental caries and abscesses, as to restore teeth. It bores through tooth enamel and removes or clean plaque from the surface of the tooth. After drilling the tooth completely, accurately and properly, it is prepared for filling with suitable material and crown to strengthen teeth. It also helps in reducing further damage. New innovations and technological advancement are replacing tungsten carbide dental drill with lasers. Nowadays, a new method known as air-abrasive technology is used by dentists of treating cavities. In this new method dentist blasts away parts of the tooth surface without using a drill.
Dentistry is defined as the evaluation, diagnosis, prevention, and/or treatment of diseases, disorders, and/or conditions of the oral cavity, maxillofacial area, and/or the adjacent and associated structures using surgical, nonsurgical, or related procedures. Concern for oral care is increasing due to rising prevalence of tooth decay, periodontal diseases, tooth erosion, and tooth sensitivity Dentists use various tools for different procedures such as removing cavity and cleaning teeth. These tools are made of metals such as stainless steel and tungsten carbide.
North America dominates the global market for electric operated tungsten carbide dental drill due to large number of aging population and increasing concern of oral hygiene. Asia is expected to show high growth rates in the next five years in the global electric operated tungsten carbide dental drill market. China and India are expected to be the fastest growing electric operated tungsten carbide dental drill markets in Asia-Pacific region. Some of the key driving forces for electric operated tungsten carbide dental drill market in emerging countries are large pool of patients, increasing healthcare expenditure and rising government funding.
In recent times there is increased use of electric operated tungsten carbide dental drill due to increasing incidence of dental disorders. Rise in aging population, increasing number of dental clinics and technological advancement are some of the key factors driving the growth for global electric operated tungsten carbide dental drill market. In addition, increasing healthcare awareness is also fuelling the growth of global electric operated tungsten carbide dental drill market. However, high cost of dental instruments, alternative technologies such as laser and brand loyalty are some of the major factors restraining the growth for the global electric operated tungsten carbide dental drill market.
Cosmetic dentistry would develop opportunity for global electric operated tungsten carbide dental drill market. However, lack of reimbursement for dental procedures could lead a challenge for the global electric operated tungsten carbide dental drill market.
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Tungsten Oxide as Rewritable Material Helps Reduce Paper Waste
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- Category: Tungsten's News
- Published on Friday, 25 November 2016 10:11
- Written by Cristina
- Hits: 844
Even in today’s digital age, the world still relies on paper and ink, most of which ends up in landfills or recycling centers. To reduce this waste, scientists have now developed a low-cost, environmentally friendly way to create printed materials with rewritable paper, which is made out of tungsten oxide and a common polymer used in medicines and food.
The U.S. has been working to reduce paper waste by increasing recycling efforts for years. According to the Environmental Protection Agency, more paper is now recovered for recycling than almost all other materials combined. This saves energy, water, landfill space and greenhouse gas emissions. But even more waste could be avoided if consumers could reuse paper many times before recycling or trashing it. So far, however, such products under development often are made with toxic, expensive organic dyes.
The researchers created a film by mixing low-toxicity tungsten oxide with polyvinyl pyrrolidone. To "print" on it, they exposed the material to ultraviolet light for 30 seconds or more, and it changed from white to a deep blue. To make pictures or words, a stencil can be used so that only the exposed parts turn blue. To erase them, the material can simply sit in ambient conditions for a day or two. To speed up the erasing, the researchers added heat to make the color disappear in 30 minutes. Alternatively, adding a small amount of polyacrylonitrile to the material can make designs last for up to 10 days. Testing showed the material could be printed on and erased 40 times before the quality started to decline.
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NMDC and MIDHANI Join Hands for Tungsten Mining
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- Category: Tungsten's News
- Published on Thursday, 17 November 2016 18:04
- Written by Cristina
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NMDC, one of India's biggest mineral producers, and Mishra Dhatu Nigam (MIDHANI) have signed a memorandum of understanding to develop tungsten minning and processing technology for the metal, a key ingredient in making heavy-alloy ammunition systems for the armed forces.
The two state-owned companies are slated to tap their complementary strengths to pursue a venture in developing tungsten mineral assets in India and abroad. MIDHANI, a defence sector PSU, has expertise in special metals and alloys. Availability of tungsten in India is limited and the metal is not mined because the ores are of low grade, NMDC said in a statement. The country's requirement of tungsten is met mainly through imports.
Extracting tungsten from low-grade deposits depends largely on developing suitable beneficiation technology. It is mainly Rajasthan that has tungsten reserves.
There is a growing requirement in India for tungsten products in industrial and defence applications, where it has been identified as a strategic material. The market for tungsten metal powder in the country is estimated at 150 tonnes per month.
China, world's largest producer of tungsten, accounts for over 80% of global output. Vietnam with 5,000 tonnes, Russia (2,500 tonnes), Canada (1,700 tonnes), Bolivia (1,200 tonnes) and Rwanda (1,000 tonnes) are the other major producers. Tungsten production globally rose to 87,000 tonnes in 2015 from 86,800 tonnes in 2014, according to the US Geological Survey.
With a strong mining background, NMDC has been working on to acquire mineral assets abroad. And Midhani, with its expertise in metals and alloys, is expected to provide technical support and coordination for Ammonium Paratungstate (APT). Their complementary strengths can facilitate in developing a venture for tungsten mineral assets in India and abroad. This alliance would strengthen both NMDC’s and Midhani’s resolve to explore jointly the available tungsten assets in India and consider investment and development abroad. The technology could also be used converting tungsten ore to APT and tungsten powder.
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