The preparation method of the traditional cemented carbide is mainly to reduce the tungsten oxide by hydrogen to tungsten powder by using a fixed bed, a rotary furnace, a hydrogen plasma, etc., and the tungsten (W) powder and the carbon (C) powder are ball milled and mixed by high temperature carbonization. The tungsten carbide (WC) is ball-milled and mixed with the pre-formed cobalt powder to obtain a tungsten carbide-cobalt (WC-Co) cemented carbide mixed powder, and then the cemented carbide is prepared by press sintering.

The inspection of 235U abundance and homogeneity of nuclear fuel rods is a very important quality control link to ensure the safe and reliable operation of nuclear fuel rods in nuclear power plants. The purpose is to avoid the hot spots caused by uneven 235U enrichment at any location during the operation of nuclear fuel rods. These hot spots may cause fuel rod rupture, contaminate coolant and cause shutdown. Therefore, the enrichment and uniformity of 235U fuel rod must be checked by 100%.

Tungsten-copper composites have high density, low thermal expansion coefficient of tungsten and high conductivity of copper. Their thermal conductivity, conductivity and thermal expansion coefficient can be designed by adjusting the content of tungsten-copper components. Therefore, they are widely used in microwave devices, integrated circuit packaging materials, electrical contact materials and military industry.

Tungsten carbide can catalyze hydrogenation, hydrogenolysis and reforming of alkanes. At the same time, nano-tungsten carbide has high electrochemical activity and good catalytic effect in low temperature acidic medium. It is acid-resistant, high temperature-resistant and CO-poisoning-resistant. It also shows catalytic oxidation performance for hydrogen, water and methanol oxidation.

Tungsten-copper composites have the advantages of tungsten and copper, high density, low coefficient of thermal expansion, good electrical and thermal conductivity, and are widely used as electrical contact materials, electrode materials and microwave power device substrates in the modern microelectronics information industry. The electronic packaging material such as the connecting member and the heat dissipating component and the heat sink material can be used as the guide material of the electromagnetic gun and the armor-piercing medicinal cover of the armor-piercing projectile.

Tungsten-titanium alloy (WTi) is widely used in micromechanical manufacturing. The tungsten-titanium alloy thin films deposited by sputtering process have high density, moderate film stress, excellent surface smoothness, excellent thermal and chemical stability, so they are ideal materials for structural layer and sacrificial layer in the manufacturing of MEMS.

Strontium tungstate is a very important functional material in tungstate. It is widely used in many fields such as photoelectric materials, gas sensitive materials, photocatalytic materials, humidity sensitive materials and so on. It is well known that the properties of nanomaterials depend on the morphology and size of nanocrystals. Therefore, the preparation of strontium tungstate nanocrystals with special morphology is of great significance in theoretical research and practical application.

It is reported that the first China International Import Expo opened in Shanghai, China National Convention and Exhibition Center (Shanghai). Among them, the largest exhibit of the “volume” at this fair is a high-precision machine tool with a total weight of about 200 tons – Jinniu Longmen Milling Machine. It comes from one of the world's largest manufacturers of high-precision heavy-duty machine tools, Germany's WALDRICH-COBO Machine Tool Manufacturing Co., Ltd.

The high-precision machine tool manufacturing company was founded in 1920 and has a history of nearly one hundred years. However, in fact, the company was acquired by Beijing No. 1 Machine Tool Plant in 2005. Therefore, strictly speaking, this company should be a subsidiary of Jingcheng Mechanical & Electrical Holding Co., Ltd., a subsidiary of Beijing State-owned Assets Supervision and Administration Commission. In fact, the major domestic technology equipment processing plants, such as aerospace, ship engines, rail transit, etc., can often see the company's products.

According to reports, the precision of this high-precision milling machine is very high, reaching the industry's top level. This "big guy" has a positioning accuracy of 4 μm and repeatability of 6 μm. In addition, it belongs to the important strategic high-tech equipment that China encourages to import and subsidize funds.

However, such a large "volume" high-precision milling machine, "small one" carbide knife (hard alloy milling cutter) is indispensable. why? We can get the relevant information directly from the word "milling machine". Milling machines, as the name implies, are machine tools that use a milling cutter made of a hard alloy milling cutter to machine various surfaces of the workpiece. Specifically, what can the milling machine do? ——It can mill planes, grooves, teeth, threads and spline shafts, as well as more complex profiles.

Why is the tungsten carbide milling cutter usually used? Instead of other materials milling cutters? Because the current use of difficult-to-machine materials is increasing, and the requirements for the mechanical properties of materials are constantly increasing. In addition, the requirements for processing efficiency are gradually increasing. However, traditional blades do not accommodate these new requirements. In short, traditional blades do not meet the high demands placed on the modern machining industry – high precision, high speed cutting and lower cost. However, the carbide-coated blades have high hardness and excellent wear resistance, which can meet the increasing requirements of mechanical processing. That is to say, cemented carbide blades are gradually replacing traditional blades.

Why is this high-precision milling machine or will it help China's aerospace industry? Because of its high-precision machine tools, it has a wide range of applications in high-end equipment manufacturing such as aerospace, rail transportation, automobile manufacturing, mold industry and machine tool production. Among them, in the field of China's aviation industry, with the increase in the number of military aircraft and the advancement of commercial aircraft projects, China will have more than 3,000 new general-purpose aircraft. These aircraft, whether the military is commercial or commercial, the processing of many parts on the fuselage requires high-precision machine tools. Therefore, the carbide CNC blade has more room to play, and the role is quite large. It can be said that if the cemented carbide blade is missing, this German high-precision machine tool is like "a tiger with its teeth and claws pulled out", and you can't do it.

With the strategic goal of China's manufacturing powerhouse - "Made in China 2025" - gradually implemented, China will make breakthrough progress in the ten key areas, and aviation equipment is among them. Aviation equipment includes aircraft, aerospace engines and aerospace equipment and systems. In recent years, domestic market demand has become stronger and stronger, and the aviation industry is facing unprecedented development opportunities and a good environment. At the same time, China's cemented carbide industry restructuring and industrial transformation and upgrading will also be promoted.

However, it must be said that the world's leading CNC blade manufacturers are mainly distributed in Europe, the United States, and Japan. Among them, Sandvik, Kenner, Iskar, Mitsubishi, Kyocera, Sumitomo and other six companies have occupied more than 90% of the domestic market share of cemented carbide CNC blades. This means that while developing high-precision machine tools in China, we must also accelerate the development of hard alloy CNC blades. Because, as we all know, modern CNC high-precision machine tools will generally be equipped with a series of tool products, which means that “the knife will not cut the woodwork” and the “worker must first sharpen its tools”, and also have the “knife” first. And "the device." Without this hard alloy knife, no matter how high-precision the machine tool can only be an axe without a blade, it is white, that is, a wooden stick. All know that wood cut trees, can not be used, the relationship between high-precision machine tools and hard alloy knives is also a rational. Therefore, in the process of promoting the rapid development of China's aerospace industry, CNC blade, as the ultimate product of the tungsten industry chain, also serves as the raw material and processing equipment material for aerospace equipment, not only accelerates the transformation and upgrading of the tungsten industry in China, but also enters the world. The symbolic products of the tungsten industry is also an indispensable indicator of China's manufacturing from a big country to a manufacturing power.

From rocket engines to all kinds of maritime hair, have countries been smashed "card necks"? This is a big proposition and a small proposition. First of all, let's talk about the Long March. As we all know, the Long March 9 carrier rocket is a new generation of heavy rockets being developed in China. It is a "sci-fi level" and will be used for deep space exploration, manned moon landing and fire, space infrastructure construction, etc. First flight between 2028 and 2030. This, time, and a little bit, let us first look at the exciting news of the neighborhood. According to Zhang Zhi, chief designer of the Long March 9 rocket, as a member of China's new generation of launch vehicles, the Long March 9 will be introduced to everyone at this year's Zhuhai Air Show. In this regard, the author wants to talk about aviation engines.

Recently, the Qingdao Metro Line 1 cross-harbour tunnel has been successfully penetrated. What is its “home position”? It laid a solid foundation for the completion of the entire line of Qingdao Metro Line 1 on schedule. It is reported that the total length of the cross-sea tunnel of Qingdao Metro Line 1 is 8.1 kilometers, of which the length of the cross section is about 3.49 kilometers. After the completion of this subway, it will greatly shorten the transit time from Qingdao Huangdao District to Qingdao's main city. This means that people who live on this small island with the characteristics of “red house green trees” have more travel plans. As a result, these small island inhabitants also have more time to enjoy the scenery and see what kind of exotic buildings are known as the “World Architecture Exhibition”.