The previous chapter introduced the performance characteristics and molding process of toughened ceramics (ZTA) , do you have a new understanding of toughened ceramics? Next, we will continue to introduce the molding process and application fields of toughened ceramics.
Introduction to the sintering process of ZTA ceramics
1. Normal pressure sintering
Normal pressure ceramics is the most common and original sintering method for ZTA ceramics, normal pressure A series of physical and chemical changes that occur in ZTA ceramics during the sintering process and the performance of the finished product are the initial basis for studying its sintering characteristics. Under the action of high temperature, the particles of ZTA ceramic body grow, the porosity decreases, and the mechanical properties increase to a certain extent.Densification.
2. Hot press sintering
One of the advantages of hot press sintering is to break the critical rules of normal pressure sintering. On the other hand, high pressure can promote the generation of residual stress, affect the transformation from tetragonal to monoclinic, and can also produce Isotropic performance.
3. Plasma sintering
Plasma sintering uses bulk heating and surface activation to achieve ultra-rapid densification of materials. < /span>
4. Microwave sintering
Microwave sintering uses microwaves to achieve high-temperature sintering of materials. It is different from conventional thermal radiation sintering. It is a volume heating effect, which has uniform sintering and It has many advantages such as low forming temperature, short sintering time, reduced activation energy, crystal refinement, and reduced pollution.
Application of ZTA Ceramics
1. Structural ceramics
ZTA ceramics have good high-temperature mechanical strength, high hardness, high elastic modulus, high flexural strength, high fracture toughness, and thermal shock resistance. Wear resistance, oxidation resistance and corrosion resistance make it widely used in structural engineering. For example: high-efficiency gas turbines, aerospace automotive parts, corrosion-resistant coatings, ceramic pipe sleeves, cutting blades, sealing valves, armor, molds and metal link components, etc.
2.Functional ceramics
ZTA ceramics have low thermal conductivity, high insulation, good matching of thermal expansion coefficient, special optical properties and good biocompatibility. It is widely used in electrical insulators, prostheses, piezoelectric ceramics, dental ceramics, ceramic films, as well as functional ceramic fields such as high-efficiency filtration, reverse osmosis, gas separation, catalysis and photocatalysis.
