Coarse Grain Tubes for Induction Heating

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Coarse Grain Tubes for Induction Heating Applications

Zircoa Coarse Grain Tubes Pressed or Cast Zirconium Oxide Compositions Engineered for High Temperature Cycling Environments

Calcia, Yttria or Magnesia stabilized coarse grain tubes are manufactured in various grain sizes, mass and shapes to satisfy your specific application and deliver long-term service. Markets served include: non-reactive firing of electronic components and crystal growing.

For more detailed information on the unique properties of Zirconium Oxide (A Grain Zirconia, ZrO₂) please visit our Solutions page, or contact a product specialist to discuss your specific needs.

Composition 1651

Tubes made of composition 1651 are typically used for high temperature induction heated crystal growing furnaces. 1651 is composed of zirconia, stabilized with 3.5% calcia by weight. These tubes will survive repeated cycling from room temperature to 2000°C (3632°F), when used with Zircoa backup material. Please contact us to discuss your specific needs.

Standard Sizes

Dimensions
OD		ID
mm	inches	mm	inches
38.1	1.50	25.4	1.00
38.1	1.50	12.7	0.50
50.8	2.00	38.1	1.50
50.8	2.00	31.7	1.25
50.8	2.00	25.4	1.00
63.5	2.50	50.8	2.00
63.5	2.50	44.4	1.75
63.5	2.50	38.1	1.50
69.8	2.75	57.1	2.25
76.2	3.00	63.5	2.50
76.2	3.00	50.8	2.00
88.9	3.50	76.2	3.00
88.9	3.50	63.5	2.50
92.2	3.63	79.5	3.13
101.6	4.00	88.9	3.50
101.6	4.00	76.2	3.00
114.3	4.50	101.6	4.00
(MORE)
(CONTINUED)
Dimensions
OD		ID
mm	inches	mm	inches
127.0	5.00	114.3	4.50
127.0	5.00	101.6	4.00
152.4	6.00	139.7	5.50
152.4	6.00	127.0	5.00
177.8	7.00	152.4	6.00
190.5	7.50	171.4	6.75
222.2	8.75	196.8	7.75

Physical Properties
of Various Zirconia Compositions

Composition	1968	1651	872	871	890	2290	3004
Stabilizer	CaO (a)	CaO (a)	CaO (a)	CaO (a)	Y2O3 (b)	Y2O3 (b)	MgO (c)
Bulk Density (g/cm3)	3.3	4.2	4.1	3	4	4.5	4.6
Porosity (%)	35	25	30	40	29	23	16
Modulus of Rupture (psi)	450	2,400	1,100	800	1300	2400	3500
Coefficient of Thermal Expansion RT-1300°C (in/in/°C)	8.2	7.3	8	7.9	9.4	5.9	2.3
Thermal Conductivity (W/m-°K) 800°C	0.68	1.2	1.2	0.52	1	1.2	1.4

a. calcia b. yttria c. magnesia

Refractory Backup (Thermal Insulation)

Extend the life of your furnace, and maintain tighter control over your furnace temperatures with Zircoa’s pre-sintered grog refractory backup (www.zircoa.com/grog).

Zircoa Backup 1859 — Partially stabilized with magnesia and calcia. Available in -8+100, -8+14, -14+28, -28+48 and -48+100 Tyler mesh sizes.

Zircoa Backup 3001 — Partially stabilized with magnesia. Available in -8+14 Tyler mesh size.

Zircoa Backup 0125 — Monoclinic zirconia, not stabilized. Available in -8+14 Tyler mesh size.

Zircoa Backup 10B – Calcia stabilized bubble zirconia. Available in -10+30 Tyler mesh size.

Zircoa Grog 1593 — Magnesia stabilized. Available in -14+28, -28+48, -48+100, -100+325 and -325 Tyler mesh sizes.

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.