December 13, 2023

Application of Zirconia Ceramics

1. Zirconia refractory

(1) Zirconia crucible

The melting point of zirconia is as high as 2700℃. Even if it is heated to more than 1900℃, it will not react with molten aluminum, iron, nickel, platinum and other metals, silicates and acid slag, so the crucible made of zirconia material can be successful Locally smelt platinum, palladium, ruthenium, cesium and other platinum group noble metals and their alloys, and can also be used to smelt potassium, sodium, quartz glass, oxides and salts, etc.

(2) Zirconia refractory fiber

Zirconia fiber is the only ceramic fiber refractory material that can be used for a long time in an ultra-high temperature environment above 1600℃. It has a higher service temperature and better than alumina fiber, mullite fiber, aluminum silicate fiber, etc. Thermal insulation, stable high temperature chemical properties, corrosion resistance, oxidation resistance, non-volatile, no pollution.

(3) Zirconia kiln materials

As a refractory material, zirconia is mainly used in the key parts of large glass tank kilns. The zirconia content of the early used zirconium refractories is only 33%~35%. The use of zirconium refractories on the top and key parts of the glass furnace greatly increases the life of the glass furnace.

2. Zirconia structural ceramics

(1) Zirconia ceramic bearings

Zirconia full ceramic bearings have the characteristics of anti-magnetic and electrical insulation, wear resistance, corrosion resistance, oil-free self-lubrication, high temperature resistance, and high cold resistance, and can be used in extremely harsh environments and special working conditions.

(2) Zirconia ceramic valve

Zirconia ceramic valves have excellent wear resistance, corrosion resistance, and high temperature thermal shock resistance, which can be competent in this field.

(3) Zirconia abrasive materials

Zirconia grinding balls have the advantages of high hardness, low wear rate, long service life, and can greatly reduce the pollution of grinding raw materials. It can ensure the quality of products. At the same time, the density of zirconia material is high. When used as a grinding medium, the impact energy is strong, which can greatly Improve the grinding and dispersion efficiency, which can effectively shorten the grinding time.

3. Zirconia functional ceramics

(1) Zirconia ceramic balls for ballpoint pens

(2) Zirconia ceramic tools

Zirconia ceramic knives have the characteristics of high strength, wear resistance, no oxidation, no rust, acid and alkali resistance, anti-static, and no reaction with food. At the same time, the knife body is shiny like jade, which is the ideal high-tech green in the world today. Knives, the main products on the market currently include: zirconia ceramic table knives, scissors, razors, scalpels, etc., which have become popular in Europe, the United States, Japan, and South Korea in recent years.

(3) Zirconia high temperature heating material

Zirconia is an insulating material at room temperature, its specific resistance is as high as 1015Ω·cm, it can conduct electricity when the temperature rises to 600℃, and it is a good conductor when the temperature is above 1000℃, it can be used as a high temperature heating element of 1800℃, and the maximum working temperature can reach 2400℃. At present, it has been successfully used in heating elements and equipment in an oxidizing atmosphere above 2000°C, and electrode materials for magnetic fluid power generation are also under active research.

(4) Zirconia bioceramic materials

The porcelain teeth made of zirconia have good transparency and excellent gloss because they do not have a metal inner coronal layer, which can effectively avoid the problems of tooth hypersensitivity and dark gum lines. It has sufficient color shading ability and can perfectly solve severe tetracycline teeth. The patient’s dental beauty needs, and the toughness of zirconia material makes up for the shortcomings of ordinary porcelain teeth that are easy to bounce. It has good biocompatibility, does not stimulate the oral mucosa tissue, and is easy to clean.

(5) Zirconia coating material

Zirconium oxide thermal barrier ceramic coating materials stabilized by high-performance Y2O3 stabilizers are mainly used in high-performance turbine aeroengines.

(6) Zirconia communication materials

In the ceramic PC type optical fiber movable connector, the zirconium dioxide pin body is its key component.

(7) Zirconia oxygen sensor

4. Zirconia decorative materials

(1) Zirconia gem material

Zirconia gem materials are divided into natural cubic zirconia and synthetic cubic zirconia. Natural cubic zirconia is extremely difficult to find in the natural state, which determines that it has the characteristics of the rarity of gem materials. Naturally formed cubic zirconia is very rich in color, and the price of large, high-quality natural zircon is by no means under the same diamond. Is a very rare precious natural gemstone. Synthetic cubic zirconia has good optical properties and is a cheap and beautiful substitute for diamonds.

(2) Zirconia ceramic jewelry

Zirconia ceramic jewelry currently has the following types: (1) Silver jewelry inlaid with zirconia, where the range of zirconia is relatively wide, including zirconia, industrial zirconia, high-purity zirconia, Stabilized zirconium dioxide, ultra-fine zirconium dioxide, zircon sand, zircon powder, etc., and silver and rhodium-plated jewelry with cubic zirconia are especially popular with European customers. (2) Pure zirconia material for wearing jewelry. (3) Wear accessories with application functions. Typical products are ceramic watch cases, bezels, straps and other products.

5. Other applications of zirconia

(1) Form a multiphase material with zirconia

Composite materials formed by compounding with other materials, such as composite materials formed by zirconia, alumina, mullite and other materials, have obtained new materials with better performance than single-phase materials.

(2) Ordinary ceramic additives

Application of ceramic color and glaze: Zirconia is a good auxiliary colorant for yellow-green pigments. If you want to obtain better performance of vanadium zirconium yellow pigment, you must choose pure zirconia. In addition, in the manufacture of glaze, pure oxide Zirconium can increase the high temperature viscosity of the glaze and expand the temperature range of high temperature viscosity changes. It has good thermal stability. When its content is 2% to 3%, it can improve the crack resistance of the glaze. It is also due to the chemical properties of zirconia. It is inert and can improve the chemical stability of the glaze and the ability to resist acid and alkali corrosion. Sometimes it is also used to make opacified glaze.

(3) Preparation of chromate raw materials

The raw materials for preparing zirconate are formed by the reaction of zirconium dioxide and some metal oxides or metal carbonates. They are all macromolecular structures with various electrical properties and are used in high temperature, electronic components and other fields.