Alumina Crucibles - Induction Melting of Superalloy Metals, in Vacuum or Oxidizing Atmospheres

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| Master Reference | Zirconia Crucibles

Alumina Crucibles for Broad Applications & Tighter Budgets

Zircoa Alumina Crucibles Engineered for Repeatable Performance and a Service Limit of 1700° C

Many Sizes to Choose From
Numerous Bottom Configurations
Responsive Order Processing
Short Lead Times
Extended Life

Zircoa’s performance engineered, hydraulically pressed, Composition 6105 delivers alumina crucibles with a uniform surface as well as precise, consistent, dimensional control from one order to the next. As a leader in the design, engineering and manufacturing of crucibles, you can depend upon Zircoa for expertise in the forming method appropriate to your application.

For immediate delivery, we inventory the most common crucible sizes, with configurations to suit your particular needs. Ideal for induction melting of superalloy metals, in vacuum or oxidizing atmospheres. Markets served include: Aerospace, Crystal Growing, Dental, Mining, Pharmaceutical, Power Generation, Medical, Precious Metals and the processing of Zircon and Zirconia.

Contact a product specialist for more detailed information, or to discuss your specific needs.

Compositions

6105 – Composition 6105 is our High Grade alumina composition. This material contains some Zirconia designed to provide longer life and superior resistance to erosion and spalling than the standard high grade alumina crucibles. Composition 6105 works best with medium to mildly aggressive alloys. For shorter run applications you will find 6105 to be an excellent choice.

Typical Chemical Analysis

Element	Composition 6105	Crucible Backup
Element	Composition 6105	1859	3001
MgO	<0.1	4.50	2.2
CaO	<0.1	4.50	0.2
Al₂O₃	94.3	0.25	0.7
TiO₂	<0.1	0.20	0.2
Fe₂O₃	0.2	0.20	0.2
SiO₂	3.5	0.60	1.2
ZrO₂	1.8	94.25	95.3
Na₂O + K₂O	<0.2	- - -	- - -

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Physical Properties

	Composition 6105	Backup Sizing
	Composition 6105	1859	3001
Density		-8+100 Tyler mesh Size	-8+14 Tyler mesh Size
g/cm³	2.8
lbs/ft³	174.8
Porosity (%)	18
Modulus of Rupture @ 70° (21°C)
psi	2800
Mpa	19.3
Thermal Expansion
CTE R.T. to 600°C	7.0 x 10^-6 in/in/°C
CTE R.T. to 100°C	8.2 x 10^-6 in/in/°C
CTE R.T. to 1300°C	8.8 x 10^-6 in/in/°C

For Even Longer Crucible Life

Zirconium Oxide (ZrO₂, A Grain Zirconia) is one of the best commercially available insulating materials. It has approximately 5 times the insulating value of alumina or magnesia. Using 1859 or 3001 Crucible Backup will extend crucible life and result in cleaner melts (www.zircoa.com/grog).

NOTICE: Recommendations, property values, and application information we publish are based on various sources including measurements by us and others, and estimates of experience. We intend this to be a reliable guide, but we do not guarantee the applicability, completeness, or accuracy of the information. Users should make their own tests to determine the suitability of any product for their application.