How to solve the problems of "insufficient density and performance fluctuation" in cemented carbide sintering?

The vacuum sintering furnace is a specialized sintering equipment developed by Hunan Jingtan Automation Equipment Co., Ltd. for fields such as cemented carbide, powder metallurgy, and special ceramics. During the sintering process of cemented carbide (WC-Co), the stability of the material's density and mechanical properties directly determines its performance in downstream applications. If the vacuum degree of a traditional sintering furnace is insufficient or the temperature field is uneven, it will cause residual pores or abnormal grain growth inside the material. The vacuum sintering furnace for refined carbon operates in a high vacuum environment. The higher the vacuum degree, the fewer chemical reactions occur in the material, which has a significant promoting effect on the shrinkage in the later stage of sintering, enabling the sintered parts to achieve higher density and more uniform microstructure. The equipment adopts an advanced furnace design concept and high-quality insulation materials to ensure the uniformity of furnace temperature under vacuum conditions. The temperature difference in the constant temperature zone can be controlled within ±7℃, ensuring that products at different positions in the same furnace batch achieve consistent sintering effects.

The degreasing control of vacuum sintering furnaces is a key link to ensure product quality. Hard alloy billet contains forming agents such as paraffin and PEG. If these organic substances are not effectively removed before sintering, they will rapidly vaporize at high temperatures, generating high-pressure gas, which can cause the billet to crack or the surface to bubble. The vacuum sintering furnace for refined carbon adopts a combined process of "slow heating + high vacuum" in the low-temperature section, which enables the forming agent to decompose slowly and be fully discharged, avoiding damage to the green body caused by excessive degreasing. The equipment is equipped with a decoking system to enhance the decoking effect, making the atmosphere inside the furnace more stable and the product quality easier to control. At the same time, it extends the service life of the carbon felt and heating materials. Domestic and international brand temperature measurement elements are used inside the furnace to ensure the accuracy of temperature measurement.

The heating system of the vacuum sintering furnace adopts square cage-type graphite rods and rod combination heating, which is convenient for maintenance and suitable for both square and circular boat dishes. The maximum temperature of the equipment can reach over 2200℃, and it is compatible with various carbonization and sintering processes. The furnace body adopts a front door or double front and rear door structure, which is convenient for loading and unloading materials. The front and rear furnace doors can be opened, making operation convenient. The product performance is good and the quality is stable. It is a widely used sintering equipment in the hard alloy industry. The equipment can be pre-evacuated and filled with various inert gases, featuring high atmosphere exchange efficiency and meeting the full process requirements from degassing, degreasing to densification and sintering.

The vacuum sintering furnace for refined carbon adopts a digital intelligent temperature control system, which automatically and precisely completes the temperature measurement and control process. The system can heat up according to the given heating curve and can store multiple process heating curves. The comprehensive PLC automatic control and protection system for water, electricity and gas achieves safety interlocking and features multiple audible and visual alarm functions such as over-temperature, sensor open-circuit, water pressure and furnace overpressure. The vacuum sintering furnace manufacturing center has established a 3D development platform for vacuum sintering furnaces, dedicated to providing customers with energy-saving, efficient, intelligent and safe professional vacuum sintering equipment. With the comprehensive advantages of "high vacuum environment, uniform temperature field, and integrated degreasing and sintering", the vacuum sintering furnace for fine carbon has become the main sintering equipment in the powder metallurgy and hard alloy industries.