Kokusai DJ 825 V 8 BL

The Hitachi Kokusai DJ 825 V 8 BL belongs to the class of furnace-based thermal processing equipment used in semiconductor manufacturing. Such systems provide a controlled hot-zone environment in which wafers are exposed to elevated temperature and selected process gases so that physical and chemical changes can be carried out uniformly across a wafer batch.

Machines of this class generally use resistance-heated furnace tubes or similar enclosed process chambers arranged around a temperature-controlled hot zone. Wafers are loaded in carriers or boats and moved into the process region, where the system establishes a defined combination of temperature, gas composition, gas flow, and time. Depending on the recipe, the process ambient may be inert, oxidizing, or dopant-bearing, and the thermal exposure causes diffusion, oxidation, annealing, or other temperature-driven reactions at the wafer surface and within previously deposited or implanted layers.

Such systems rely on tight control of thermal uniformity, gas delivery, exhaust handling, and contamination isolation. A process cycle commonly includes chamber conditioning, wafer loading, temperature ramping, soak under the target ambient, and controlled cool-down before unload. The class is designed to maintain repeatable conditions from run to run so that material properties, junction formation, film characteristics, and electrical behavior remain consistent.