General knowledge of coating: crystal properties of titanium dioxide
-
Last Update: 2020-04-03
-
Source: Internet
-
Author: User
Search more information of high quality chemicals, good prices and reliable suppliers, visit
www.echemi.com
It is suggested that titanium dioxide has three crystal forms in nature: rutile, anatase and plate titanium The plate titanium type belongs to the rhombic crystal system, which is unstable It can be transformed into rutile type at 650 ℃, so it has no practical value in industry Anatase is stable at room temperature, but it should be transformed to rutile at high temperature The conversion strength depends on the manufacturing method and the addition of inhibitors or accelerators in the calcination process It is generally believed that there is almost no crystal transformation below 165 ℃, and the transformation is very fast when the temperature is over 730 ℃ Rutile is the most stable crystalline form of titanium dioxide with dense structure, Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Home of coatings: titanium dioxide has three crystal forms in nature: rutile, anatase and plate titanium The plate titanium type belongs to the rhombic crystal system, which is unstable It can be transformed into rutile type at 650 ℃, so it has no practical value in industry Anatase is stable at room temperature, but it should be transformed to rutile at high temperature The conversion strength depends on the manufacturing method and the addition of inhibitors or accelerators in the calcination process It is generally believed that there is almost no crystal transformation below 165 ℃, and the transformation is very fast when the temperature is over 730 ℃ Rutile is the most stable crystalline form of titanium dioxide, with dense structure Compared with anatase, rutile has higher hardness, density, dielectric constant and refractive index Rutile type and anatase type belong to tetragonal system, but they have different crystal lattice, so the X-ray image is also different The diffraction angle of anatase type titanium dioxide is 25.5 ° and that of rutile type is 27.5 ° Rutile crystals are elongated, prismatic and usually twin, while anatase crystals are generally regular octahedrons Compared with anatase type, rutile type is composed of two titanium dioxide molecules and anatase type is composed of four titanium dioxide molecules, so its unit lattice is smaller and closer, so it has greater stability and relative density, so it has higher refractive index, dielectric constant and lower thermal conductivity Among the three isomers of titanium dioxide, only rutile is the most stable, and only rutile can be obtained by thermal conversion The anatase can also be transformed into rutile at about 915 ℃ Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,
This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only.
This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of
the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed
description of the concern or complaint, to
service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content
will be removed immediately.