What is the difference between imported and domestic zirconium dioxide?

1. The hazards are different

Imported zirconium dioxide.

Because it needs to be refined and prepared, its radioactivity.

It is very low, it has no effect on the body, and the time spent in the mouth for 20 years is not as good as 20 minutes of sun exposure.

Water content of domestic zirconium dioxide.

The difference, and the difference in the preparation process, leads to a relatively high brittleness, that is, brittleness, and a slightly higher relative lead content than imported zirconia.

2. The quality is different

The porcelain combination and hardness and water content of imported zirconium dioxide are better than those of China, and we can often see the color of domestic zirconium blocks white and broken one after another.

Hello! Is there a difference between cotton imports and domestic production? Does oil make a difference?

All raw materials. ......The problem is not in imports and exports, but in quality. Zirconium ore is the same, but the thickness will be different in the preparation process, the content will be different, and the results will be different.

The zirconium powder used for porcelain teeth is first pressed into blocks, and then processed and molded according to the different teeth of each person. Generally speaking, granulated powder with poor quality cannot be made into teeth, and qualified teeth can be processed into good powder.

At the beginning, there was no domestic porcelain block in China, and foreigners made a lot of money. At present, the hospital price is 3,601 teeth, which is calculated from the import price, and it has not been reduced so far. Imported porcelain blocks cost thousands, and domestic porcelain blocks are only hundreds, which is more than ten times worse.

Also, at the beginning, nearly 2 million machines were imported, but now there are only 300,000 domestic ones. The ** caused by foreigners has made ordinary people unable to install all-porcelain teeth. Today, we have localized, and through the supervision of the state, we have laid the foundation for price reduction.

By the way, due to the best advantages, now the export volume of porcelain blocks is greater than the domestic use. Many of them are also sold domestically and imported at risk.

All of them are domestic, and the best ones will be sold cheaper when they are imported than they are, and the ones that are bad in quality will be sold cheaper when they are domestically produced.

At present, domestic zirconia materials have obtained medical device product licenses, such as Altron zirconia.

As long as you have a product license, you can use it with confidence.

Zirconia and all-ceramic teeth are not the same, identification method:

1. Zirconia has a quality certificate, you can root the code of the quality certificate, and you should be able to find the information of your tooth on the Internet, so as to judge whether it is zirconium dioxide.

2. It may be difficult for laymen to identify materials, so they can apply to a third-party medical institution for material appraisal and request material appraisal.

3. Compared with the blind filial piety color of traditional porcelain teeth, the color and luster of zirconia porcelain teeth are natural and clean, the appearance is realistic, and the transparency is strong.

Zirconia fiber is a polycrystalline refractory fiber material. Due to the high melting point, non-oxidation and other high-temperature excellent characteristics of ZRO2 substance, ZRO2 fiber has a higher service temperature than other refractory fiber varieties such as alumina fiber, mullite fiber, aluminum silicate fiber, etc.

Zirconia fiber can be used for a long time in an ultra-high temperature oxidation atmosphere of more than 1500, with a maximum service temperature of up to 2200, and even to 2500 can still maintain a complete fiber shape, and the high temperature chemical properties are stable, corrosion resistance, oxidation resistance, thermal shock resistance, non-volatile, non-polluting, and it is currently the top refractory fiber material in the world. The acid and alkali corrosion resistance of ZRO2 is much stronger than that of SiO2 and Al2O3. Insoluble in water, soluble in Qipai and sulfuric acid and hydrofluoric acid; Slightly soluble in hydrochloric acid and nitric acid.

It can be eutectic with alkali to form zirconate.

Preparation process: stable oxidation of industrial refractory materials with high zirconium, most of which are obtained by electric melting. Carbon and stabilizer calcium oxide are added in the process of zircon electromelting, and at the same time of silicon removal, zirconia and calcium oxide react to form a solid solution, and then crushed and granulated to obtain stable zirconia.

Stabilized and partially stabilized zirconia used in fine ceramics are generally extracted by wet method.

At present, the most mature and commonly used is the neutralization and precipitation method, and its preparation process is shown in the figure. The purified zirconium chloride is dissolved in pure water, the insoluble matter is removed by filtration, the zirconium concentration in the solution is adjusted, and the required amount of yttrium chloride solution (or chloride solution of other rare earth metals or alkaline earth metals) is added, and ammonia water is added to neutralize the precipitation. The sediment is washed with hot water, filtered, dried and calcined.

After crushing and other treatments, the calcined product can obtain ultra-fine stable zirconia powder.

The above content reference: Encyclopedia - zirconium dioxide.

Answer: Zirconia refers to cubic zircon, because it was invented by the Soviets, so it is also called Soviet stone. Zirconia belongs to zirconia crystals, which usually take the form of monoclinic crystals, so zirconia mainly exists in the form of the mineral oblique zirconite, that is, cubic monocrystals.

Zirconia refers to cubic zircon, which is a type of zirconia crystal, mainly in the form of the mineral oblique zircon. Although the hardness of zirconia is only about Mohs scale, which is slightly inferior to diamond, it has surpassed most natural gemstones. Coupled with the reason why different metal oxides are added to the production process of zirconia, crystals of different colors can be obtained.

Zirconia and diamonds have a higher density, although the hardness of zirconia is only about about Mohs scale, which is lower than that of diamonds, but overall it has surpassed most natural gemstones. In addition, the surface of zirconia has a metallic luster and has a very high dispersion value, so it will look very bright when decorated with zirconia on the body.

Since zirconia needs to add different metal oxides in the production process, crystals of different colors can be obtained, such as adding cerium to get yellow, orange, red, adding chromium to get green, neodymium to get purple, erbium to get pink, titanium to get golden brown, etc.

A handmade, a week after taking the model to wear a tooth A computer-controlled, machine automatic in vitro production, generally do not have to wait, you can wear it on the same day.

German Wieland, right? There can be a warranty card box, you can check it on the Internet, and these are not fake.