High-performance long-life neutron tube has made important progress

[ Instrument Network Instrument Development ] The national key R&D program, which is led by Jiangxi Donghua Jinke Industrial Co., Ltd., is a key project for the development of major scientific instruments and equipment. The project "Development and Application of High-Performance Long-Life Neutron Tubes" has been in the target for nearly two years. Breakthroughs have been made in key technologies such as membrane preparation, ion source design and manufacturing, and neutron tube life improvement, and high-performance long-life neutron tubes with independent intellectual property rights have been developed. Recently, the project passed the mid-term inspection organized by the High Technology Center of the Ministry of Science and Technology.

Neutron tube is a core component widely used in petroleum logging, non-destructive testing, medical and nuclear physics research. It has small size, high safety, good controllability (no neutrons when not energized), and easy to use. The advantages of radiation protection.

The project started from the key technologies of neutron tube structure design, material selection, processing, process optimization and neutron generator dedicated power supply hardware and software development. In the research process, reliability design and accelerated aging evaluation technology were introduced, and neutrons were systematically introduced. The tube performance and quality reliability assessment mechanism runs through the whole process of research and development, focusing on engineering bottlenecks such as long-life, high-temperature neutron tube batch manufacturing stability, and research and development of high-performance neutron tubes and supporting neutrons with independent intellectual property rights. The generator realizes application verification in the field of uranium neutron logging and neutron online component analysis, and achieves the expected results.

The next step of the project will be to develop and produce higher performance neutron tubes, and to carry out engineering and industrialization of high-performance long-life neutron tube development and application, to form mass production capacity, and to provide and support China's nuclear science and technology innovation and development. Strong support.

(Original title: High-performance long-life neutron tube made important progress)

There are two families of Ni-Resist austenitic cast irons. These are the standard or flake graphite alloys and the ductile or spheroid graphite alloys. As time passes, the spheroidal grades, because of higher strength, ductility and elevated temperature properties are becoming more prominent. However, the flake materials with lower cost, fewer foundry problems and better machinabilityand thermal conductivity are still produced by many cast iron foundries. General characteristics of both groups are described bellow.

Corrosion Resistance: The Ni-Resist is specified for handling salt solutions, sea water, mild acids, alkalies and oil field liquids, both sweet and sour. Their corrosion resistance is far superior to that of normal and low alloy cast irons. They are not stainless steel and do not behave as such. They are characterized by uniform corrosion rather than by localized deterioration.

Wear Resistance: Cylinder liners, pistons, wear rings and sleeves, bearing , glands and other metal-to â€“metal rubbing parts are cast in Ni-Resist alloy. Their galling resistance is excellent.

Erosion Resistance: Slurries, wet steam and other fluids with entrained solids are substance which is extremely erosive to most metals. Ni-Resist alloy offer a combination of corrosion-erosion resistance which is superior in these environments. They are outstanding when compared to grey cast iron, ductile irons and steel.

Toughness and Low Temperature Stability: Ni-Resist Cast Iron are much superior to grey cast iron, particularly at low temperatures.

Controlled Expansion: Expansivities from as low as 5.0x10 to as high as 18.7x10 cm/cm are possible with the different Ni-Resist alloys. The lower value makes possible a cast metal with low expansivity for precision parts. Also, the range permits matching Ni-Resist castings with many different metals and alloys.

Magnetic and Electrical Properties: Some Ni-Resist iron is non-magnetic. These and others have high electrical resistance. Thus, they are used for resistance grids, electric furnace, in clutches and other applications requiring these properties combined with machinability heat resistance.

Heat Resistance: Originally, because of good heat and oxidation resistance, the flake graphie Ni-Resist alloys were used at temperature up to 700â„ƒ. However, because of the superior elevated temperature properties of the spheroidal graphite Ni-Resists, the flake alloys are now seldom used above 315â„ƒ. Spheroidal Graphite Ni-Resist austenitic cast iron can be and are used at temperature up to 1050 â„ƒ. Although the ductile alloys are better, all Ni-Resists have relatively low rate of oxidation in air. The resulting oxides adhere tenaciously, further reducing oxidation with time.

Machinability: The machining techniques possible for Ni-Resist castings are similar to those for the higher strength grads of gray cast iron and austenitic stainless steel.

Castability: Complicated and intricate designs that are often difficult to cast in other materials are possible with Ni-Resist iron. This leads to products that are economically produced.

The main application for Ni-Resist is in Gas Turbines and automotive exhaust and turbocharger systems, where temperature fluctuates between 500 and 1050 centigrade. Ni-resist is suitable in these applications because its ductility, hot strength and low coefficient of thermal expansion provide best resistance to such sever thermal shocks.

A&M Manufacturing Co.Ltd. can provide ductile Ni-resist according to the following standards:

ASTM A571:1984, grade D5S

EN-GJSA-XNiCr35-5-2

BS 3468:1986

DIN 1694: GGG-NiSiCr35.5.2

Ni-Resist

Investment Castings Auto Parts,Nickel Based Alloy Investment Castings,Spheroidal Graphite Ni-Resist,Ni-Resist Cast Iron

A&M manufacturing co.Ltd , http://www.am-casting.com