Application of SPS Sinter in the Development of New Materials

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Its typical applications mainly include the following type of materials .

1. Intermetallic compounds

Intermetallic compounds can effectively utilize temperature brittleness and high melting point, so their preparation requires a special process. Using the SPS method to prepare intermetallic compounds can effectively utilize the self-heating effect and surface activation between particles to achieve low-temperature and rapid sintering. At present, the intermetallic compound systems that have been successfully prepared include Ti-AI series, Mo-Si series, Ni-Al series and so on.

2. Ceramic materials

The time required for spark sintering is extremely short, almost no grain growth occurs, and the reproducibility is good. After mixing 20% (volume) Al2O3w and ZrO2 (3Y), the discharge micro-junction can achieve a densification degree of more than 99% at a temperature above 1578, and its flexural strength, fracture toughness and hardness are all excellent. It has also successfully developed ceramic composite materials such as Ln4Al2Og-SiC, SiC-S1, ZrO2Al2O3 and AIN. Some domestic scholars have successfully prepared transparent AlN ceramics by using SPS technology, using CaFz as sintering agent and ZrO2 as sintering aid, sintering at 2123K for 15 minutes.

3. Nano materials and amorphous and quasicrystalline materials

The biggest feature of SPS is that it can be sintered quickly in a short time and can obviously inhibit the coarsening of crystal grains, so it may become an effective method for preparing nanomaterials and amorphous and quasicrystalline materials. Risbud et al. used SPS technology to sinter nano-level γ-Al2O3 doped with MgO. Compared with traditional pressureless sintering and hot-press sintering, it can significantly reduce the sintering temperature, shorten the sintering time, increase the density of the sintered body, and make the grain fine Evenly. Tracy et al. used SPS technology to mix the nano-sized Nb powder and Al powder, and simultaneously complete the Nb3Al synthesis and sintering process in the plasma activated sintering equipment. The process takes only a few minutes at a lower temperature (1023~1173K). After completion, the resulting product has better superplasticity.

4. Carbide alloy

Some scholars used SPS and ordinary vacuum sintering to sinter 92WC-8Co nano cemented carbide. The results show that the temperature of SPS sintered cemented carbide is significantly reduced, the firing time is greatly shortened, and the growth of WC grains is effectively inhibited.

Editor: Baccata

Copyright: SIMUWU Vacuum Furnace