According to foreign media newatlas reports, except for oil companies, it is estimated that everyone hopes that electric aviation can take off as soon as possible. The aviation industry is a huge source of pollution, and electric aircraft are not only cleaner but also cheaper in terms of energy and maintenance. However, the current problem is that the energy density of the battery can not reach any aviation practical occasion at this stage, and it cannot be guaranteed that a lot of research in the field of batteries will soon change this situation.
Many companies now begin to view hydrogen energy as a solution. The battery is still a better solution for 99% of car use, but the excellent energy density of hydrogen makes it a better potential object. For anything flying, people do not need to build a huge distribution network to Meet the mid-range hydrogen flight. In fact, if you can send electricity to the airport, you can get hydrogen on site.
To this end, foreign media newatlas interviewed Val Miftakhov, founder and CEO of ZeroAvia, a company that has made a big bet in the field of hydrogen fuel in the aerospace industry. Unlike some companies that focus on the short-range eVTOL air taxi market, ZeroAvia focuses on the development and modification of fuel cell power systems for small passenger aircraft of 10-20 seats to develop mid-range regional flights. The company said that such operations can reduce costs by up to 50%. According to Miftakhov, they are not competing with batteries, but with aviation fuel.
According to Miftakhov, their development work started as early as the end of 2017, but the initial team was established the following year and started ground testing of the power system. In February 2019, they installed the first version of the power system on a six-seat, two-ton Piper Malibu M330 aircraft in the United States. This prototype not only obtained the FAA's initial certification, but also took a test flight last spring. Miftakhov said that the test flight allowed them to learn a lot, and earlier this year, they built a second prototype in the UK and plan to start flight testing of the aircraft in Cranfield.
However, because of the new engines including battery power and other non-traditional engines-of course, there is no guide for them to include hydrogen power, so for Miftakhov, they are doing what the US FAA and UK CAA are doing now. thing. According to the plan, they will develop a system for certification and guidelines for testing guidance after 12-18 months.
In addition, according to Miftakhov, the challenge of hydrogen fuel is fuel storage, and a classic approach is to use compressed gas cylinders. ZeroAvia’s fuel tank technology can achieve a mass fraction of 10-11% (mass fraction refers to the fuel tank The percentage of fuel in the system). In other words, a kilogram of fuel system is required to store one kilogram of fuel. Miftakhov believes that they can put this technology into commercial use within three years.
Vitrified Grinding Wheels mean grinding wheels in ceramic bonded. Vitrified grinding wheels can be superabrasive grinding wheels like diamond grinding wheel or CBN Grinding Wheels. It also can be abrasive grinding wheels such as white aluminum oxide grinding wheel,pink grinding wheel,silicon carbide grinding.
Vitrified grinding wheel is only one type of bond, which is ceramic, it can be in any type of abrasive.
The main ingredient of vitrified bond are vitreous material with low melting point, such as borosilicate glass, lead glass, etc.It is widely used in various grinding methods such as outer circle, inner circle, flat surface, centerless, etc. It is the most commonly used bonding agent for abrasive tools.
Vitrified bond is characterized by high chemical stability, almost can work in a variety of cooling media, small elastic deformation, brittle, can be made into a variety of hardness levels of grinding tools to adapt to the processing of various hardness of the workpiece. Vitrified bond has good self-sharpening.
The grinding efficiency of single crystal diamond with vitrified bond grinding wheel is higher than metal bond grinding wheel. The wear ratio is very small and the processing cost is low. Therefore, the grinding efficiency of single crystal diamond with ceramic bond grinding wheel can be greatly improved.
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