A vacuum sintering furnace is a type of furnace used for protective sintering of heated materials in a vacuum environment. It employs various heating methods, such as resistance heating, induction heating, and microwave heating. A vacuum induction furnace utilizes induction heating for protective sintering of materials and can be classified into power frequency, medium frequency, and high frequency types, falling under the subcategory of vacuum sintering furnaces. The vacuum induction sintering furnace is a complete set of equipment that uses medium-frequency induction heating under vacuum or protective atmosphere conditions to sinter cemented carbide tips and various metal powder compacts. It is designed for the industrial production of cemented carbides, metallic dysprosium, and ceramic materials.

A vacuum sintering furnace operates by first evacuating the chamber and then introducing a hydrogen protective atmosphere. It utilizes medium-frequency induction heating to generate high temperatures in a tungsten crucible positioned within a coil, transferring heat to the workpiece via thermal radiation. This furnace is suitable for scientific research and military applications involving powder forming and sintering of refractory alloys such as tungsten, molybdenum, and their alloys.

To ensure the normal operation of a vacuum sintering furnace, it is necessary to install flow switches on each cooling water circulation pipeline for uninterrupted cooling water alarm monitoring. Previously, mechanical flap-type flow switches were used in heating furnaces. After several months of practical use, continuous operation can lead to rusting of the switch contacts, resulting in issues such as drifting action points, deformation, or cracking of the flaps. Moreover, mechanical products have limitations, including relatively slow response speeds, which cannot meet the requirement for rapid response. If the alarm point needs to be reset, the flap-type flow switch requires replacement of the flap, causing unnecessary inconvenience for on-site personnel.

Vacuum sintering refers to the process in which powders, powder compacts, or other forms of materials are heated in a vacuum environment at appropriate temperatures to achieve interparticle bonding through atomic diffusion. The purpose of sintering in high-temperature vacuum sintering furnaces is to impart specific structures and properties to porous powder compacts, resulting in alloys.

Common Issues and Solutions for High-Temperature Vacuum Sintering Furnaces: Q: The high vacuum level cannot be achieved in the vacuum sintering furnace, but there is no air leakage (i.e., the vacuum gauge reading remains unchanged for a long time). What could be the reason?