What Specific Impact Does the Ttemperature Uniformity of Vacuum Hot Pressing Sintering Furnace have on the Sintering Effect of Workpieces Made of Different Materials?
Release time:
2025-12-22
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Abstract
The temperature uniformity of the vacuum hot pressing sintering furnace has a decisive impact on the sintering effect of workpieces of different materials, mainly reflected in density, microstructure, dimensional accuracy, and performance consistency. The specific manifestations vary depending on the material system:
Ceramic materials (such as alumina, silicon nitride, silicon carbide):
This type of material relies on high-temperature diffusion to achieve densification. If the temperature difference inside the furnace is large (such as ± 10 ℃ or more), it will lead to uneven local sintering rates, resulting in "over burning" or "under burning" areas. Abnormal grain growth and decreased mechanical properties in the overburning zone; Residual pores in the undercooked area reduce strength and airtightness. High temperature uniformity (usually within ± 3 ℃) can ensure overall density, fine and uniform grain size, and improve fracture toughness and thermal stability.
Metals and alloys (such as tungsten, molybdenum, titanium alloys):
High melting point metals are temperature sensitive, and temperature differences can easily cause uneven recrystallization or phase transition differences. For example, titanium alloys may form an imbalance in the alpha/beta phase ratio in non-uniform temperature fields, leading to fluctuations in mechanical properties; Refractory metals may experience insufficient local plastic deformation, which can affect the final density and dimensional accuracy. Good temperature uniformity helps to achieve consistent grain structure and mechanical properties.
Composite materials (such as C/C, metal/ceramic matrix composites):
Multiphase systems are highly sensitive to thermal history. Uneven temperature will exacerbate the inconsistency of interface reactions, causing local stress concentration, interface debonding, or component segregation. For example, in the preparation of SiCf/SiC composites, temperature differences may lead to differences in precursor cracking rates, affecting fiber protection and matrix integrity.
Functional materials (such as transparent ceramics, magnetic materials):
Extremely sensitive to micro defects. Temperature fluctuations can induce disorder in the orientation of light scattering centers (pores, second phases) or magnetic domains, significantly deteriorating optical transmittance or magnetic properties.
Therefore, in the process of vacuum hot pressing sintering, high temperature uniformity is not only the foundation of process stability, but also a key technical indicator to ensure the consistency of high-end material performance and yield.
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2026-01-21
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