Industry Knowledge
What are the production process advantages of tungsten rods?
Raw material purity control
Nantong Rongxin has profound technical accumulation in the field of tungsten and molybdenum materials. Relying on advanced tungsten powder purification technology, the raw material purity is increased to more than 99.99%. This process ensures the uniformity of tungsten powder particle size through multi-stage chemical refining and physical screening processes, and the average particle size is controlled within the range of 2.0-3.0μm, laying a solid foundation for the subsequent molding process.
Powder metallurgy and isostatic pressing
Nantong Rongxin's innovation in the field of powder metallurgy combines cold isostatic pressing (CIP) with injection molding technology to achieve a double breakthrough in the densification and complex shape processing of tungsten rods. The cold isostatic pressing process presses tungsten powder into a high-density blank under a high pressure of 240MPa, and the density can reach more than 18.5g/cm³. The injection molding technology uses a polymer binder system to evenly mix tungsten powder and additives and inject them into the mold. After degreasing and sintering, a high-precision tungsten rod is finally obtained.
Ultra-low temperature sintering and deformation strengthening
Nantong Rongxin's original "ultra-low temperature sintering + multi-pass deformation" process significantly improves the comprehensive performance of tungsten rods. During the sintering stage, the gradient heating technology under hydrogen protection is used to achieve dense bonding of tungsten particles at a high temperature of 2300°C. At the same time, liquid phase doping (such as adding metals such as Co and Ni) is used to inhibit the growth of grains and obtain a fine-grained structure. In the subsequent forging deformation process, the company uses three passes of deformation processing to achieve a total deformation of 80%, which refines the grains to the submicron level and increases the hardness to more than 428HV.
Precision machining and surface treatment
For different application scenarios, Nantong Rongxin provides full-process services from rough machining to ultra-precision machining. Through rotary forging, grinding, polishing and other processes, the diameter of the tungsten rod can be processed to a range of 0.1-50mm, and the surface roughness can reach Ra≤0.02μm. In addition, the company has also developed surface treatment technologies such as vacuum coating and chemical plating, which significantly improve the wear resistance, corrosion resistance and conductivity of tungsten rods. For example, in the production process of electron tube filaments, the chemical nickel plating process is used to extend the product's service life to more than 5,000 hours, and the light efficiency attenuation rate is less than 5%. The application of these technologies ensures Changrongxin Technology's leading position in the field of tungsten and molybdenum materials, and can provide customers with high-performance and high-reliability product solutions.
What are the precautions when using tungsten rods?
Safety protection
Dust, debris and harmful gases may be generated during the high temperature, high pressure and mechanical processing of tungsten rods, so it is necessary to build a double barrier of "individual protection and environmental control" to ensure the safety of operators.
In terms of individual protection measures, operators must wear dust masks (such as KN95 level) that meet the GB 2626 standard, and wear anti-static work clothes, anti-cut gloves and goggles. In high-temperature application scenarios, additional heat-insulating gloves and protective masks are required to effectively resist the risks brought by high temperatures.
In terms of environmental control, the production workshop needs to be equipped with an efficient dust removal system to ensure that the dust concentration is less than 1mg/m³, which is far lower than the national occupational exposure limit of 6mg/m³.
Operation Specifications
The performance of tungsten rods is highly dependent on the matching of processes, so when formulating operation specifications, it is necessary to start from the material properties.
In terms of temperature control, the recrystallization temperature of tungsten rods is 1200-1400℃, and the processing temperature must be strictly controlled within this range. For example, in the process of tungsten rod welding, it is recommended to use pulsed argon arc welding, and the current is controlled at 150-200A to avoid overheating and grain coarsening.
In terms of machining, the hardness of tungsten rods can reach 68-70HRA, and diamond or cubic boron nitride (CBN) tools must be used. The cutting speed should be controlled at 30-50m/min, and the feed rate should not exceed 0.05mm/r. Nantong Rongxin has verified through experiments that the optimized processing parameters can extend the tool life by 40%.
In terms of equipment matching, for the high-temperature application of tungsten rods, the tungsten rod furnace developed by the company adopts the "U-shaped tungsten rod heating element and zirconia lining" structure, the firing temperature can reach 2500℃, and the furnace shell temperature is controlled below 60℃ through the water cooling system to ensure the stability and safety of the equipment.
Environmental control
During storage and transportation, tungsten rods must be isolated from highly reactive substances such as oxidants and halogens, and prevent mechanical damage.
In terms of storage requirements, tungsten rods should be stored in a cool, dry warehouse, away from fire sources and acid-base environments. It is recommended to use sealed iron barrels for packaging, each barrel has a built-in desiccant, and is marked with a "moisture-proof, anti-oxidation" warning sign to ensure that its performance is not affected.
In terms of transportation specifications, tungsten rods must be transported in special shockproof packaging to avoid mixing with oxidants and edible chemicals. The company has passed the ISO 9001 quality management system certification to ensure traceability of the entire process from raw material storage to finished product delivery.
In terms of taboos, it is strictly forbidden to use ordinary grinding wheels when grinding, drilling, etc. on the surface of tungsten rods to avoid high temperatures and combustion. The company recommends the use of electrolytic processing or laser processing technology to achieve stress-free and pollution-free precision molding.
Emergency treatment: Rapid response mechanism from leakage to fire
For the sudden risks in the use of tungsten rods, a graded emergency plan must be formulated to ensure rapid response in the event of an accident.
In terms of leakage treatment, if the tungsten rod powder leaks, the contaminated area should be immediately isolated, covered with plastic cloth and collected in a special container. It is recommended to use a combination of "vacuum cleaning and wet cleaning" to avoid dust flying and ensure environmental safety.
In terms of fire response, dry powder fire extinguishing agent or sand should be used to extinguish the fire when the tungsten rod burns, and water should never be used to prevent the fire from spreading. Nantong Rongxin has established a complete emergency response mechanism to ensure that actions can be taken quickly and effectively in emergencies to ensure the safety of personnel and the integrity of equipment.
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