Compared with traditional ceramic materials, ceramics sintered with nano titanium oxide produced by SAT NANO have the following characteristics:

1. Mechanical properties

The mechanical properties of nano-oxide ceramics include the hardness, fracture toughness and low-temperature ductility of nano-ceramic materials. Especially the hardness and strength are greatly improved at high temperature, and the emergence of nano-ceramics will help solve the problem of strengthening and toughening of ceramics. Research on nano-titanium dioxide, it is found that when compressed at room temperature, the nano-particles have good binding properties, and they will be densified quickly above 500 ℃, while the grain size only slightly increases, and the hardness and fracture toughness values obtained are better. , And the sintering temperature is 400~600℃ lower, and sintering does not require any additives. The hardness and fracture toughness of nano-titanium dioxide increase with the increase of sintering temperature (that is, the decrease of porosity). Sintered at a temperature range of 800℃~900℃, the hardness and fracture toughness of the two are consistent with the optimized sintered bulk ceramics. After low-temperature sintering, nano-TiO2 can obtain better mechanical properties. After nano-titanium dioxide is sintered at 800℃, Vickers hardness H=630, fracture toughness KIC (MPa·m1/2) is 2.8, porosity is 10%; while sintered at 1000℃, H=925, KIC=2.8, porosity Is 5%.

2. Strength, hardness and toughness
The hardness and strength of many nano-ceramic materials are 4 to 5 times higher than that of ordinary ceramic materials. For example, at 100°C, the microhardness of nano TiO2 ceramics is 1300kgf/mm2, while the microhardness of ordinary TiO2 ceramics is lower than 200kgf/mm2. Nano ceramic materials made of nano ultrafine particles have good toughness. It is because the solid material made of ultrafine particles has a large interface. The arrangement of atoms at the interface is quite chaotic. The atoms are easy to migrate under external force and deformation conditions, so they exhibit good toughness. With a certain degree of malleability. The nano-titanium dioxide ceramic crystals at room temperature show high toughness, and they will not be broken when compressed to 1/4 of the original length.

3.  Superplasticity
Nano-oxide ceramics have superplasticity similar to metals at high temperatures, which has become one of the most eye-catching focuses in the field of nano-oxide ceramics. Superplasticity refers to the ability to produce abnormally large tensile deformations without damage under stress. As we all know, ceramic materials are transition bond types with directional ionic bonds and covalent bonds, and the dislocation density is small, and the grain boundaries are difficult to slip, making the ceramics have high hardness and high brittleness. Ordinary ceramic materials hardly produce plasticity at room temperature. deformation. Only when the temperature reaches above 1000℃, the ceramic has a certain degree of plasticity due to the acceleration of the thermal movement of the particles.

Recent studies have found that the deformation rate sensitivity of nano-titania and nano-zinc oxide ceramics increases significantly as the particle size decreases, mainly due to the decrease of pores in the sample. It can be considered that this trend is inherent to fine-grained ceramics. The deformation rate sensitivity at the finest grains is about 0.04, indicating that these ceramics are ductile. Although they do not exhibit room temperature superplasticity, this may exist as the grains decrease further. It is generally believed that ceramics should have two conditions for superplasticity: (1) Smaller particle size; (2) Fast diffusion path (enhanced crystal lattice, grain boundary diffusion ability). Nanoceramics have smaller crystal grains and fast diffusion pathways, so they are expected to have room temperature superplasticity.

Nano-ceramics have superplasticity, overcome the defects of ceramic products that are difficult to process, and are beneficial to the commercialization of ceramic products.

As a new type of high-performance ceramics, nano-ceramics is a brand-new science and technology developed in recent years. It will become the most important high-tech in the new century and will attract more and more attention from scientists all over the world.

SAT NANO is one of the best supplier of TiO2 titanium oxide nanopowder in the world, we can supply 5nm, 10nm, 30nm, 50nm, 100nm, if you have any enquiry, please feel free to contact us at admin@satnano.com