DH &DL Type SIC Heating Element

DH &DL type is a resistive SIC heating element. DH&DL type is tubular, depending on the diameter. They have a heating part called the hot zone and two end parts called the cold end. The end of the element is metallized with aluminum to provide a low resistance contact surface, and the braided aluminum strip is used for electrical connection.

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Operating Temperature:

DH &DL type is a straight rod type resistance heating element made of green silicon carbide as the main raw material, through hydraulic preliminary forming, baking, sintering and recrystallization, hot and cold end resistance cooperation and 2400 ℃ secondary sintering according to a certain proportion. The temperature of SIC heating element can reach 1450 ℃. When the temperature reaches 1300 ℃, a dense glass oxide film can be formed on the surface of the rod, which prevents itself from being oxidized, thus greatly prolonging the service life of the rod.

The resistance value of the heating element will increase and age with the extension of service time. When the resistance of the element increases to 3 times the initial resistance value, it is regarded as the end of service life. There are several factors affecting the aging and life reduction of components:

*Working temperature * materials burned and harmful substances produced

*Connection mode of component surface load * circuit

*Furnace atmosphere * temperature control mode

*Working mode (continuous or intermittent)

When used in 1450 ℃ clean oxidation atmosphere, the heating element can obtain a relatively long service life. In order to achieve the best service life, the surface load as low as possible should be considered when designing the furnace, and 3-8w / cm² is recommended 。

Physical Properties：

Bulk density	2.5g/cm3
Porosity	23%
Thermal Conductivity	14-19W/m·℃ （1000℃）
Rupture Strength	50Mpa（25℃）
Specific Heat	1.0kj/kg·℃ (25~1300℃)
Coefficient Of Thermal Expansion	4.5×10-⁶

DH Type Rod Shape With High Resistance

Nominal Loading（At1000℃）
Part.No	Dia（mm）	Hot Zone Length（mm）	Cold End Length（mm）	Overall Length（mm）	Hot Zone Surface Area （cm）²	Voltage（V）	Power（W）	Resistance（Ω）
DH1402020	14	200	200	600	90	50	1400	1.8
DH1402021		300	250	800	132	70	2100	2.3
DH1443525		400	250	900	176	100	2800	3.6
DH163020	16	300	200	700	150	70	2400	2.0
DH164525		450	250	950	225	110	3600	3.3
DH166025		600	250	1100	300	140	4800	4.1
DH165025		500	250	1000	250	120	4000	3.6
DH203025	20	300	250	800	188	65	3000	1.4
DH207030		700	300	1300	439	150	7000	3.2
DH203030		600	300	1200	376	130	6000	2.8
DH201003		1000	300	1600	627	210	10000	4.4
DH253030	25	300	300	900	236	55	3600	0.9
DH255040		400	400	1200	314	75	4700	1.2
DH256040		600	400	1400	470	110	7000	1.7
DH258040		800	400	1600	627	150	9400	2.4
DH304030	30	400	300	1000	380	65	5600	0.8
DH305040		500	400	1300	470	80	6900	0.9
DH308030		800	400	1600	750	130	11300	1.5
DH3010040		1000	400	1800	940	160	14100	1.8

DL Type Rod Shape With Lower Resistance

Nominal Loading（At1000℃）
Part.No	Dia（mm）	Hot Zone Length（mm）	Cold End Length（mm）	Overall Length（mm）	Hot Zone Surface Area （cm）²	Voltage（V）	Power（W）	Resistance（Ω）
DL1402020	14	200	200	600	88	47	1480	1.49
DL1402021		300	250	800	132	69	2170	2.19
DL1443525		400	250	900	176	90	2840	2.86
DL163020	16	300	200	700	150	63	2390	1.7
DL164525		450	250	950	225	93	3530	2.45
DL166025		600	250	1100	300	122	4640	3.21
DL203025	20	300	250	800	188	58	3100	1.08
DL205030		500	300	1100	314	94	5030	1.76
DL209030		900	300	1500	565	165	8830	3.08
DL254030	25	400	300	1000	314	70	5000	0.98
DL256040		600	300	1200	470	100	7150	1.40
DL256040		600	400	1400	470	102	7290	1.43
DL258040		800	400	1600	627	134	9580	1.87
DL304030	30	400	300	1000	380	62	5800	0.66
DL307030		700	300	1300	660	106	9900	1.13
DL308040		800	400	1600	750	122	11400	1.3
DL306030		600	300	1200	570	91	8510	0.97
DL321638	32	406	280	965	405	59	6060	0.57
DL322648		660	280	1219	659	95	9855	0.92
DL323052		762	280	1321	760	110	11380	1.06
DL323263		813	394	1600	811	117	12140	1.13

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