The sintering pressing force in hot pressing sintering refers to the external force applied during the sintering process.
This force helps to accelerate material flow, rearrangement, and densification.
The pressing force typically ranges from 10 to 40 MPa.
The range depends on the strength of the mold material.
The application of this force, combined with heat, significantly enhances the densification process.
This allows for the production of fully dense and fine-grained products in a shorter time and at lower temperatures compared to normal pressure sintering.
5 Key Points Explained: What You Need to Know About Sintering Pressing Force
1. Definition and Range of Sintering Pressing Force
The sintering pressing force is the external force applied during the hot pressing sintering process.
It typically ranges from 10 to 40 MPa.
The range depends on the material's properties and the desired outcome.
2. Effect of Sintering Pressing Force on Densification
The pressing force accelerates the movement of particles.
This facilitates their rearrangement and densification.
Hot pressing sintering allows for a lower sintering temperature.
The temperature is about 100°C to 150°C lower compared to normal pressure sintering.
The combined effect of heat and pressure results in a faster densification process.
This enables the production of fully dense products in a shorter time.
3. Advantages of Hot Pressing Sintering
The required molding pressure is only about 1/10 of that needed in cold pressing methods.
Materials like A12O3, BeO, BN, and TiB2 can be formed into large-sized products.
Simultaneous heating and pressurization help in mass transfer processes.
This reduces sintering time and inhibits grain growth.
4. Stages of Densification in Hot Pressing Sintering
Early Stage: Rapid increase in density (from 5% to 60%) within the first few minutes.
Middle Stage: Particle rearrangement, local fragmentation, and filling of large aggregate clearance occur.
Later Stage: Densification slows down as the contact surface of particles increases, and particle boundary slippage becomes less likely.
5. Comparison with Normal Pressure Sintering
The driving force in hot pressing sintering is 20 to 100 times larger than in normal pressure sintering.
Hot pressing sintering effectively removes pores between powder particles.
This enhances the material's mechanical and high-temperature properties.
6. Total Sintering Driving Force
The total sintering driving force includes both the intrinsic curvature-driven sintering stress and the applied external stress.
The applied pressure's significance depends on the relative magnitudes of these two components.
By understanding these key points, a lab equipment purchaser can make informed decisions.
This ensures optimal results in terms of product density, grain size, and overall performance.
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