High Purity Alumina
4N High purity alumina powder for high pressure sodium lamp
Custom 4N High purity alumina powder for high pressure sodium lamp sizes available upon request.
Alumina (aluminium oxide) is a stable oxide of aluminium. Its molecular formula is Al2O3. Its molecular weight is 101.96, CAS NO. 1344-28-1, EINECS NO. 215-961-6. It is a kind of high hardness compound, white powder, melting point 2054 C, boiling point 2980 C, ionizable ionic crystal at high temperature. It is often used to make refractories. It is also known as bauxite in mining, ceramics and materials science.
It has different crystalline forms, there are more than 10 known crystalline forms, mainly three types, namely alpha-Al2O3, beta-Al2O3 and gamma-Al2O3. The common ones are alpha -Al O and -Al -Al O. Corundum in nature is alpha-Al rammed O rammed, hexagonal compactly packed crystals, density 3.965g/cm 3, hardness 8.8, insoluble in water, acid or alkali. -Al O, a cubic tightly packed crystal, is insoluble in water but soluble in acids and bases. These homogeneous and heterogeneous crystals of Al2O3 have different structures and properties. Al2O3 is almost completely transformed into alpha-Al2O3 at high temperatures above 1300 C.
Our company's product HW201-ND is a high purity alumina powder specially used for high pressure sodium lamp production. So what's so special about it?
It is a high-purity nano-alumina powder prepared by chemical method and processed by physical deep processing in the later stage. It is specially developed for the production of high-pressure sodium lamp tubes.
The chemical and physical parameters are as follows:
Al2O3 Content %
The arc tube is the key component of the high-pressure sodium lamp. When the arc tube is working, sodium vapor at high temperature and high pressure is very corrosive. Usually the translucent polycrystalline alumina and ceramic tube are used as the arc tube body. It not only has good heat resistance and sodium vapor corrosion resistance, but also has good visible light penetration ability. Polycrystalline alumina ceramic tube (CAP) is made of polycrystalline alumina ceramic powder by mixing powder, spray drying, isostatic pressing, sintering, high temperature sintering and cutting.
The optimum sintering temperature of polycrystalline transparent alumina ceramics made of high purity alumina is generally between 1750 1800 and the holding time is 1-3 hours. The higher the purity of alumina, the better the transparency of the fired alumina ceramics. The total and linear transmittance of the sintered alumina ceramics are much higher than that of the ordinary pure alumina, with high density and no pore. The particle size is less than 1um, the sintering temperature is low, and the energy consumption is low. It has good color rendering performance, high luminous efficiency and long life in the arc tube of luminescent lamp.
Packing: 25KG/40KG carton or drum
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The bridge between the Chinese market and the foreign market
QingdaoHaiwei Emerging Materials Co., Ltd. is located in the beautiful port city –Qingdao,China.The company is formerly known as E&H International Business Co. Ltd, and inearly 2017 was reorganized to be Qingdao Haiwei Emerging Materials Co.,Ltd. Itis engaged in exporting deep processed alumina, fine aluminum hydroxide and itsrelated products, as well as importing metallurgy grade alumina and aluminum hydroxide as raw material of deep processed alumina products. The company'sproducts are widely used in various fields, including optical instrument, automobile manufacturing, paper industry, electronics industry, instrumentation, construction industry, petroleum refining and so on.
As a company with over 10 years-experience of export and import inalumina field, the company has accumulated a number of high-quality products suppliers and established a good solid relationship with them. These qualified suppliers play an important role in the company's development, by providing astable supply of goods and technical support for our new and oldcustomer. Besides, we believe in that reliable logistics support is also aprerequisite for the development of foreign trade business. After more than 10 years of development, the company has rich experience in communication andcooperation with shipping companies and their agents, further ensuring thesmooth export of goods to the designated addresses of customers
Geographically Convenient Location
We are located in Qingdao, one of the most well- known import and export ports in China. Most of our factories are built in Shandong Inland. The transportation from our factory to Qingdao port takes only few hours by express way.
Having Experienced Staff
In the past decades, we are devoted ourselves in alumina field. We know segment market of every product,including their production, quality control, packing, usage and safe transportation.
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We live on the details of order processing, including clear requirement of technology and specification, quality and cost control, inspection, document processing and safety logistics. Most of all, credibility and integrity is first and foremost and the base for our development.
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