High-temperature vacuum hot presses achieve densification sintering and forming of refractory materials—such as ceramics, carbon-carbon composites, and high-temperature alloys—by applying mechanical pressure in a high-temperature environment while maintaining high vacuum conditions throughout the process. Through precise, coordinated control of temperature, pressure, and vacuum levels, it effectively prevents oxidation of materials at high temperatures while promoting material diffusion creep and plastic flow. This process yields high-performance components with densities approaching theoretical limits and uniform microstructures. Its core value lies in forming high-purity, highly dense, complex-shaped specialty material parts with significant advantages including controllable composition, minimal defects, and outstanding performance. It finds extensive applications in aerospace, nuclear energy, high-end cutting tools, and electronic semiconductor industries.
PRODUCT DESCRIPTION
1. Loading and Evacuation Stage: Precisely load the powder, green compact, or preform to be pressed into the mold (typically made of graphite or stainless steel), then transfer the entire assembly into the sealed chamber of the vacuum hot press furnace. The chamber is then sealed, and the high-vacuum system is activated to reduce the internal pressure to a high vacuum state (typically below 10⁻² Pa), thoroughly purging oxygen and other harmful gases. Concurrently, the heating system initiates operation, gradually heating the mold and material according to a preset temperature ramp curve to the target sintering temperature (which can reach 1200°C–2200°C depending on the material).
2. Vacuum Hot Pressing Stage: Once both temperature and vacuum level stabilize within preset ranges, precise axial mechanical pressure (typically ranging from several MPa to tens of MPa) is applied to the mold via a hydraulic or electric servo system. Under the combined effects of high temperature, high pressure, and high vacuum, the material undergoes particle rearrangement, diffusion mass transfer, and plastic flow. Pores are effectively eliminated as the material densifies and forms the predetermined shape. This process effectively prevents material oxidation and element volatilization while suppressing abnormal grain growth.
3. Cooling and Pressure Relief/Part Removal Stage: After completing pressure holding and heat retention, heating is stopped. Under maintained vacuum or inert protective gas conditions, the furnace and mold undergo controlled cooling. Once the temperature reaches a safe range, mechanical pressure is first released. The furnace chamber is then filled with inert gas to atmospheric pressure. Finally, the furnace lid and mold are opened, and the densified, formed part is removed. The resulting component exhibits high density, fine grain size, uniform microstructure, and outstanding mechanical and physical properties.
CUSTOMIZED PRODUCTS
We offer customized cellulose ether solutions to match your specific application, viscosity, setting time, and performance requirements.
中文 
