MoZrO₂

MoZrO₂ is a unique Molybdenum (Mo) alloy material, doped with Zirconium Oxide (ZrO₂), for advanced glass melting applications. With small quantities of ZrO₂ added to Mo, the inherent properties of electrodes for glass manufacturing processes significantly improves. Not only does MoZrO₂ exhibit excellent creep resistance, but it is also demonstrates a high resistance to glass melts.

For some specialized applications, such as the glass used in the solar industry or container glass, MoZrO₂ proves beneficial. In the production of solar glass, refining agents may be present, which may affect the grain structure of pure Mo, leading to potential damage to electrodes. Uniquely, MoZrO₂ can withstand the aggressive nature of this environment without potential damage. In the production of green and brown glass, often used in the container industry, MoZrO₂ may reduce the potential for electrode corrosion.

Technical Data

This specification covers ZrO₂-Doped Mo GMEs.
(Mo-1.7 wt% ZrO₂)

Chemical Characteristics¹
(Mass fraction in % [cg/g]; ppm [μg/g])
¹Information on testing methods available upon request.

The chemical composition of molybdenum powder used for producing glass melting electrodes shall conform to the following limits:

Mo (By Difference)	min.	98.50%
Mg	max.	0.001%
Mn	max.	0.001%
Ni	max.	0.002%
Al	max.	0.002%
Cu	max.	0.002%
Pb	max.	0.002%
Ti	max.	0.002%
Ca	max.	0.003%
Si	max.	0.003%
Sn	max.	0.003%
C	max.	0.005%
Fe	max.	0.005%
Cr	max.	0.005%
Zr	max.	1.2-1.4%

Structure

Electrodes will normally be shipped as stress relieved. Material can be supplied in the re-crystallized condition upon request.

Dimensional Tolerances

Diameter inches | mm	Diameter Variation inches | mm	Out-of-Round inches | mm
1-1/4 | 31.7	+/- 0.015 | ± .38	0.015 | 0.38
1-1/2 | 38.1	+/- 0.015 | ± .38	0.020 | 0.51
2 | 50.8	+/- 0.030 | ± .76	0.025 | 0.63
2-1/2 | 63.5	+/- 0.030 | ± .76	0.025 | 0.63
3 | 76.2	+/- 0.040 | ± 1.0	0.035 | 0.89
4 | 101.6	+/- 0.040 | ± 1.0	0.050 | 1.27

Straightness

Maximum variations from straightness will be 0.030 inch per foot (2.50 mm per meter). Maximum variation in cut lengths will be +1/4“, -0 inch (+6.35 mm, -0 mm). Special available tolerances upon request.

Threading

U.S. and European standard and special threads are available on either or both ends.

Surface Condition

Molybdenum glass melting electrodes will be supplied with centerless ground or machined surfaces of 128 micro inch or better. Minor surface imperfections may be removed by conditioning while maintaining the dimensional tolerance.

Identification

All electrodes identified with an appropriate lot number. All shipments marked with the name of the customer and the purchase order number.

Hazards identification in Advertising (REGULATION (EC) No 1272/2008 Article 48) None.

Rejection

Elmet Technologies must receive written notification of rejected material with the reason for rejection. The right is reserved to inspect rejected material at customer plant for claim validation. The material may be returned only after proper authorization.