耐火材料致密刚玉_产品

产品属性

型号

DFA

种类

其他

规格

段砂

材质

氧化铝粉

粒度

1-3mm

所有参数

电熔致密刚玉就是以工业氧化铝为主要原料，在三相电弧炉内使γ-AL2O3转变为α- AL2O3而成。γ-AL2O3转变为α-AL2O3是单向的致密刚玉，主晶相大于96%，气孔率小于4%，转化后的体积变化率大约缩小14%左右，因此致密刚玉具有良好的抗酸碱性能，在高温下具有良好的耐磨、抗侵蚀及体积稳定性。

致密刚玉作为**耐火材料，广泛应用于冶金、石化、建材、高温陶瓷、机械等行业，特别是在陶瓷辊道棒、连铸三大件、大型出铁沟等方面有广泛的用途。

Dense fused corundum is made fromγ-Al2O3 by transforming it intoα- Al2O3, which is aunidirectionalprocess, in the 3-phase Arc Furnace, using industrialalumina asmain raw material. Its main crystal phase content is morethan 96%,while the porosity rate less than 4%.And the volume-changeratiodecrease by about 14% after the transformation, hence, densefusedcorundum possesses good acid and kali resistance, and hasgoodabrasion-resistance, erosion-resistance and volume stabilityathigh temperature.

As a kind of top refractorymaterial,dense fused corundum is widely used in industries likemetallurgy.,petrochemical, building materials, high temperatureceramics,mechanical manufacture and etc., especially in themanufacture ofthe ceramic rollers, three-pieces shroud, monolithicstopper andiron runners for large blast furnace and so on.

致密电熔刚玉理化指标Dense Fused Corundum’sphysiochemicalindexes:

规格specifications		主要化学成分main chemical component %				磁性物magnetic material content%
		Al2O3	Fe2O3	SiO2	Na2O
I	段砂section sand	≥98.3	≤0.15	≤1.00	≤0.10	≤0.15
	细粉fine powder	≥987.8	≤0.30			≤0.10
II	段砂section sand	≥99.0	≤0.10	≤1.00	≤0.10	≤0.05
	细粉fine powder	≥98.6	≤0.10			≤0.05

致密电熔刚玉物理性能指标DenseFusedCorundum’s physical property indexes:

项目item	指标index
颜色color	灰白gray
晶型crystalline system	6方晶型hexagon
硬度hardness (莫氏)（mohs scale）	≥9.0
熔点melting point (℃)	2250
**使用温度maximum operated temperature(℃)	1900
真密度real density（g/m³）	≥3.90
线膨胀系数linear expansion coefficient（1600℃）	7-9