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        微钠白刚玉微粉
        分类: 微钠白刚玉微粉  发布时间: 2013-12-12 21:17 

        微钠白刚玉微粉

                微钠白刚玉微粉简介

        Introduction of low-sodium white corundum micropowders



        经过五年多的研发,我公司已能批量生产微钠白刚玉块、段砂、粒度号砂、磨粉、微钠白刚玉微粉等。

        After 5 years of research and development, Zhengzhou Yufa Abrasive Co.Ltd has already mastered the technology of producing low-sodium white corundum block,  section corundum sand, grain corundum sand, grinding powders, and low-sodium oxide white corundum micropowders in quantity.

         

        微钠白刚玉微粉是由我公司生产的微钠白刚玉块经深度精加工而成。

        Low-sodium white corundum micropowder are carefully manufactured from the low-sodium white corundum blocks made by ourselves.

         

        微钠白刚玉是指:含氧化钠量在0.010.09%之间的白刚玉。它的原料是经过深加工的氧化铝。微钠白刚玉是白刚玉中一种含氧化钠量较低的产品。普通白刚玉中的氧化钠含量在0.2—0.6%之间。

        Low-sodium white corundum indicates the white corundum in which the content of sodium oxide is between 0.01-0.09%, and the raw material of which is   alumina processed in depth . Low-sodium white corundum is a type of low sodium-content product. By contrast, the sodium content in the common white corundum is between 0.2%—0.6 .

         

        微钠白刚玉的主相是α-Al2O3。

        The main phase of the low-sodium white corundum is α-Al2O3.

         

        氧化钠对于白刚玉是一种有害杂质,它与氧化铝在熔融状态下生成β-Al2O3,生成量随氧化钠含量的增加而增大。β-Al2O3的熔点低,体密低,硬度低。白刚玉中的Na2O主要以Na2O·11AL2O3(β-Al2O3)的形式出现,如果氧化铝原料中含有0.6%以上的氧化钠,利用它生产的白刚玉中就会含百分之十以上的β-Al2O3

        Sodium oxide is a harmful impurity in white corundum. It can react chemically with alumina in melting state and generate β-Al2O3 . The higher the sodium oxide content is, the more the β-Al2O3 forms. β-Al2O3 is featured with low melting point, low bulk density, and low hardness. The sodium oxide is coming in the form of Na2O·11AL2O3(β-Al2O3). If the sodium oxide content in alumina is higher than 0.6%, the β-Al2O3 content in the produced white corundum will be higher than 10% .

         

        β-Al2O3α-Al2O3相比有三低,一是熔点低,二是密度低,三是硬度低,具体如下表所示。                                                              

        Compared to α-Al2O3,β-Al2O3 has lower melting point, lower density, and lower hardness, as shown in the following table.


        名称Phase

        化学成份

        Chemical compositions

        晶系

        Crystal system

        密度

        Density

        (g/cm3

        显微硬度

        Micro hardness

        (Kg/mm2)

        熔点Melting point

        ()

        α-Al2O3

        Al2O3

        六方

        Hexagonal

        4.0

        2300

        2050

        β-Al2O3

        Na2O·11Al2O3

        三方

         Trigonal

        3.24

        1300~1600

        1600














        我公司生产的微钠白刚玉α相率可达98%以上。

        The α-Al2O3 content of the low-sodium oxide white corundum produced by Yufa is higher than 98%.

        下表所示是我公司为某单位生产的微钠白刚玉1-0段砂的化学成份

        The following table shows the chemical compositions of the low-sodium oxide white corundum 1-0 section sand for a customer.

        报告编号

        Report No.

        Na2O%

        SiO2%

        Fe2O3%

        Al2O3%

         

         

         

         

        2013-06-693

        0.01

        0.034

        0.012

        99.84

        下表所示是我公司为某单位生产的微钠白刚玉块的化学成份

        The following table shows the chemical compositions of the low-sodium oxide white corundum block for a customer.

        报告编号

        Report No.

        Na2O%

        SiO2%

        Fe2O3%

        Al2O3%

        减%

        LOI

         

         

        2009-04-134

        0.06

        0.02

        0.02

        99.84

        0.06

        下表所示是我公司为某单位生产的微钠白刚玉325#粉的化学成份

        The following table shows the chemical compositions of the low-sodium oxide white corundum 325 powder for a customer.

        报告编号

        Report No.

        Na2O%

        SiO2%

        Fe2O3%

        Al2O3%

        减%

        LOI

         

        2009-12-855

        ,0.02;

        0.05

        0.02

        99.82

        0.09

        下表中所示我公司为某位生产的微钠白刚玉10段砂的化学成份

        The following table shows the chemical compositions of the low-sodium oxide white corundum 1-0 section sand for a customer.

        报告编号

        Report No.

        Na2O%

        SiO2%

        Fe2O3%

        Al2O3%

        减%LOI



        2009-12-886

        0.02

        0.04

        0.03

        99.79

        0.12

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