The full name of JEOL is Japanese Electron Optics Laboratory. After decades of exploration and research by the world’s top scientific instrument manufacturers, they create the brand JEOL. Nowadays, JEOL products are widely applied in the fields of medicine, biology, biochemistry, agriculture, material science, metallurgy, chemical, petroleum, pharmaceuticals, semiconductor and electronics. EB (electron beam) tungsten filament of JEOL is known to the Chinese businessmen. So far, there are more than 2000 users of JEOL in China. In China, EB tungsten filament of JEOL is used by a key laboratory sciences sector, research institutes, universities, medical institutions, government agencies and enterprises.

EB tungsten filament of JEOL has a strong vacuum system, which is widely applied in a SEM (scanning electron microscope). EB tungsten filament of JEOL uses the newest electro-optical systems to enhance the image quality scanning electron microscope. The main specifications of EB tungsten filament of JEOL are 0.55mm of mosquito type, 0.65mm of mosquito type, 0.8mm of mosquito type, 0.8mm of eccentric type and 0.55mm of half-moon type. EB tungsten filament of JEOL has a strong plasticity in maintaining electron gun and optical coating.

EB tungsten filament of JEOL is made of tungsten with a high-grade.  Its features are high melting point and low coefficients of thermal expansion. This kind of tungsten is the best material for EB tungsten filament. The main types of EB tungsten filament of JEOL is K type. The diameter of its ceramic plate is 28.0 mm, the pin diameter is 1.2 mm, and the distance of center pin is 8.0 mm.

Compared with HIP (Hot Isostatic Pressing) process, CIP (Cold Isostatic Pressing) is a kind of molding process that commonly all directions sealed in plastic mold material simultaneously even pressure at room temperature, and more for powdered metal or non-metallic materials, molding, which provides a pre-sintered compacts for sintering. Tungsten copper is a kind of psudoalloy consists of W and Cu mutually soluble and has a great difference in physical and chemical properties. So it is difficult to prepare by conventional methods, which must be prepared by PM (Powder Metallurgy) process. According to different pressure transmission fluid, including cold isostatic wet bag method and the dry bag method isostatic pressing and soft mode.

Since the conventional molding method between the powder and the powder, powder and punch and die wall there is a certain friction, so that during the pressing force distribution and transmission of certain changes occur, and also resulted in various parts of the compact density and intensity distribution uneven; by comparison, CIP has more uniform forming pressure, which can ensure under lower pressures have pressed leather uniform density and integrity of shape and small loss of mold, high molding efficiency.

In addition, it should be noticed that pressing speed controlling is also a significant factor of the blank density during CIP process. It not only affects the state of friction and work hardening powder particles, but also affects the case of gas escaping. If the compression speed is too fast, the gas can not escape easily, which left in the blanks in the relatively more in the subsequent sintering process are correspondingly difficult to eliminate left voids or pores. Furthermore, pressing too fast will make the inside of the powder aggregate greater stress, resulting in relief the compacts elastic aftereffect. Therefore, in the process of compacting, reduce the speed and extend the dwell time appropriately can ensure that pressure transmission fully, air between powders have sufficient time to escape and be beneficial for density distribution.

Tungsten carbide transferring ball, as the name suggests that it is a kind of flexible sphere can run in all directions. So it also has been called universal ball, transferring roller or bull’s eye, etc. Due to the flexibility universal ball rolling, the work bench or other original material quality or bulky workpiece can be more portable to slip, which also greatly reduces the labor intensity of the operator. Universal ball is suitable for transporting the items with smooth and strong surface of bottom, such as cardboard boxes, plastic crates, pallet parts, and surface roughness of the steel sheet-like object. In addition, according to different load requirements, it can adjust the density distribution of transferring ball, or can choose transferring ball with different materials and carrying capacity.

Commonly transferring ball materials includes steel ball, stainless steel ball, carbon steel ball, bearing steel ball, galvanized steel ball, plastic steel ball, tungsten carbide ball and so on. By comparison, tungsten carbide transferring ball has the better properties among them. Tungsten carbide is composed of WC and Co, WC has higher hardness and Co added improves the toughness, strength and wear resistance. It by carbide ball and the support base with the completion of transfer of the workpiece. Tungsten carbide transferring ball has higher machining accuracy and the surface without secondary treatment.

The surface toughness of common steel ball can not meet the requirements, which electrically galvanized or chrome effect will be affected. And secondary processing if the grinder be polished, dimensional accuracy will be affected to some degree. Except surface quality, there are several evaluation parameters of universal ball overall quality, such as flexibility, noise and dimensional accuracy. Generally, plate with your fingers on the ball was moving moment of inertia of the ball more than three seconds for qualified. The noise is related with ball accuracy and the quality, tungsten carbide ball has higher accuracy and quality so its noise is lower and the rotation is smoother and more uniform.

All EB (electron beam) tungsten filaments are made of tungsten which is also known as wolfram. The EB tungsten filament has a good discharge performance and an excellent anti-sag performance. The two characteristic can ensure that the filament is not deformed during working. The following classifications are the main types of EB tungsten filament.