Products

Home / Products/ High Purity Alumina / Alumina for Special Ceramics

$Alumina As Refractory Material$
$HPA Refractory Material$

Alumina As Refractory Material

1. Alumina as refractory material, has flame retardancy.
2. Alumina has a high melting point and is a high quality raw material.
3. High strength and hardness.
4. Has electrical insulation, corrosion resistance and good air tightness.

Send Inquiry

Product Introduction

Product Introduction:

Alumina as refractory material has higher hardness and slightly lower toughness. It also has high purity, self-sharpening ability, high cutting rate, less calorific value, high efficiency, acid and alkali resistance characteristics, good thermal stability.Aluminaas refractory material has the characteristics of high hardness, high compressive strength, wear resistance, abrasives, chemical inertness, high refractoriness, excellent electrical insulation properties, dielectric properties, high melting point, etc.

Product Parameter (Specification)

Item		Typical Value
Item		AM-CA-RC-9FG	AM-CA-RC-1	AM-CA-RC-A99
Chemical Composition	Al2O3 (%)	≥99.5	99.72	＞99
	SiO2 (%)	0.06	0.05	＜0.1
	Na2O (%)	0.12	0.04	≤0.4
	Fe2O3 (%)	0.04	0.04	≤0.1
	MgO (%)	0.02	0.02	-
	CaO (%)	0.02	0.02	-
Physical properties	BET Specific Surface Area (m2/g)	0.93	1.28	1-2
	Particle Size D50 (μm)	5.2	3.70	4-6
	Particle Size D90 (μm)	22.7	9.2	-

Remarks:Can produce the specifications customers provide or give a customize a solution.

Application:

The thermal shock resistance of alumium oxide refractory depends on its microstructure and the shape and size of the product. Generally speaking, its thermal shock resistance is medium. In short, It has the properties of high temperature resistance, high strength, high hardness, oxidation resistance, electrical insulation, corrosion resistance, and good air tightness. Therefore, as a special refractory material, it is widely used. The representative use is to use its high temperature resistance, corrosion resistance and high strength as sliding nozzles, immersion nozzles, metallurgical high-purity metals or crucibles for growing single crystals in steelmaking production, and structural parts of various high-temperature furnaces. (furnace wall, furnace tube), heat-resistant and anti-oxidative coating, etc.

After replacing the Al2O3 with an appropriate amount of high-temperature powder, the high-temperature resistance of the refractory material did not decrease but increased, and the linear change rate of the refractory also increased. The reason is that adding an appropriate amount of high-temperature aluminum can appropriately increase the density of the castable. At high temperature, high-temperature al2o3 can also form mullite with micro-silica powder, which improves the high-temperature strength of the castable. Therefore, when adding high-temperature powder to refractory materials, it must be used, and low-purity high-temperature alumina powder cannot be used cheaply.