W Type Molybdenum disilicide Mosi2 electric heating elementsts for lab furnace

 W Type Molybdenum disilicide Mosi2 electric heating elements for lab furnace     What’s the Molybdenum disilicide(MoSi2) heating element? Molybdenum disilicide(MoSi2) heating element is one resistance heating component made from MoSi2 or as the basic material. When it’s heated to high temperature under the oxidizing atmosphere, one dense MoSi2film will be formed on its surface to protect the element against oxidizing further. Therefore, the element has unique anti-oxidation property under high temperature atmosphere. The highest temperature can reach 1800°C, the applicable temperature is between 500-1700°C. Applications: It can be used as heating elements of industrial high-temperature furnace, like ceramics, magnetic materials, glasses, metallurgy, refractories etc.   The Specifications and Dimension Mark of MoSi2Heating Element     When you enquiry, please tell us the following data: DI: Diameter of Hot Zone(mm) D2: Diameter of Cold Zone(mm) Le: Length of Hot Zone(mm) Lu: Length of Cold Zone(mm) A: Shank Spacing(mm)         Physical and Chemical Properties   1. Physical Property

Volume Density	Bending Strength	Vickers Hardness	Porosity	Water Absorption	Heating Elongation Rate
5.5g/cm³	15-25kg/cm³	(HV)570kg/mm³	7.4%	1.2%	4%

  2. Chemistry Property Under high temperature, MoSi2 heating element will form one SiO2 protective film on the surface, which prevents the element from oxidizing continuously. When the element temperature is over 1700 °C, the film becomes melting. It’s not suitable for long time use in the temperature range of 400-700°C, otherwise, the element will be powdering for the strong oxidation under low temperature.   3. The Influence of Different Atmospheres  

Atmosphere	The Max Using Temperature of Element
	1700 Grade	1800 Grade
NO2, CO2, O2, Air	1700 °C	1800 °C
He, Ar, Ne	1650 °C	1750 °C
SO2	1600°C	1700°C
CO, H2	1500 °C	1600 °C
Wet H2	1400°C	1500°C
Dry H2	1350°C	1450°C

    Electric Property   1. Resistance Property The resistivity of element rapidly rises as the temperature rises. Under normal operating conditions, the element resistance generally doesn’t change with the service life, so the old elements can be used with the new elements together.   2. Surface Load Choosing element surface load based on furnace structure, temperature as well as atmosphere, is the key of optimizing element service life. The below picture shows the relationship among the furnace temperature, element temperature and surface load under the circumstance that thermal element radiation is not hindered. The shadow part is for common surface load and temperature range.   Recommend Surface Load    

Furnace Temp(°C)	1400	1500	1600	1650	1700
Surface load of hot zone(w/cm2)	<18	<15	<12	<10	<8

  Advice of Installation 1.  MoSi2 heating element is very brittle under room temperature but plastic in high temperature, so it’s better to install the U type element hanging vertically. The aim is to avoid putting the mechanical stress directly to the Hot Zone of the element, otherwise, the element will be broken easily. If hanging horizontally installation, please use high temperature refractory for support and hang the MoSi2 element horizontally. 2. Please put the taper part of the element bottom into the furnace chamber to avoid local overheating. 3. The lead wire should be a little longer than the linear distance between the element and bus line to avoid putting the stress to the element. 4. Please don’t tighten the screw of clamps too much at one time. It can be tightened when the element heats up to high temperature because of the element’s plasticity. 5. The temperature of the clip should be less than 200°C, the contact voltage between the clip and the elements less than 0.1V. 6. The distance between the lower end of the clip and the upper surface of the through brick should be more than 50mm, to avoid the radiation heat conducting to the clip. 7. To avoid damage, 170A couldn’t be long time used for the element of Ø6/12mm; 300A couldn’t be long time used for Ø9/18mm element.     Notice to Furnace Operation To avoid high current surges which may cause damage to MoSi2 Heating Elements, the recommend starting procedure as following:   

Small Furnace (Power <100KW)		Big Furnace (Power 100KW-500KW)
Furnace Temperature .C	Voltage	Furnace Temperature .C	Voltage
20-150	1/3 Working Voltage	20-300	1/3 Working Voltage
150-500	2/3 Working Voltage	300-700	1/3 Working Voltage
500-Working Temperature	Full Working Voltage	700-working Temperature	Full Working Voltage

    Electric property    1)Resistance property  The resistivity of element rapidly rises as the temperature rises. Under normal operating conditions, generally the element resistance doesn’t change with service time changing. So the old and new elements can be mixed used.      2) Surface load According to the structure, the temperature and atmosphere in the correct choice of components surface load is the key element to the highest life. The picture shows that the relation among  the surface temperature, the element temperature and surface load under the circumstance that the thermal radiation components is uncrossed. The shaded part is for common surface load-----the temperature range.         Installation and accessories    1) Advice of Installation   Mosi2 heating element is very brittle under room temperature and plastic under high temperature. Therefore,it's the best way for installation of u type element to hand it vertically.Such way is to avoid putting the mechanical stress directly to the Hot zone of the element,otherwise, the element will be broken easliy .If it needs hand horizontally, please chose a spport of high themperature refactory.         2) Accessories    The temperature of clip should be less than 200 .C;the contace voltage between the clip and the element should be less than 0.1V. The distance between the lower end of the clip and upper surface of the through brick should be more than 50mm,to avoid the radiation heat conduction to the clip.      Package and shipping   First carton packaging with plastic inside to protect, then wooden packaging outside; For some special conditions, use iron hanger outside wooden case. 2. Shipping Fedex/DHL/UPS/TNT for samples, Door-to-Door; By Air or by Sea for batch goods; Customers specifying freight forwarders or negotiable shipping methods; Delivery Time: 3-7 days for samples; 5-25 days for batch goods.     Factory show                                                                                                                             FAQ                                                                                                                                                                                     Company Information   DENGFENG CITY YUHAO HIGH TEMPRETURE COMPONENT CO. LTD is experienced in manufacturing high-temperature heating elements and tungsten and molybdenum products with quality control system, advanced equipment, good production environment, strong technique strength and complete test facilities. We produce SiC heating element, MoSi2 heating element, molybdenum powder, molybdenum mandrels, molybdenum wire, molybdenum crucible, molybdenum electrode, molybdenum bar, tungsten powder, tungsten electrode, tungsten electrode crucible, tungsten wire and tungsten pole etc. All of our products have passed ISO9001:2008 quality system authentication. The company is awarded as national advanced enterprise for many years.   Our company has been committed to the research and development of high-temperature material and technology for many years in order to improve the product quality. With rich manufacturing experience, complete quality control system and scientific management, we provide high quality and mature service to the domestic and international clients and win their trust & reliability. By now, YUHAO products have been exported to Germany, Italy, South Korea, Japan, Ukraine, Russia, Canada etc. more than 60 countries.   Sincerely hope to have chance working with you and establish long term cooperation relationships. WELCOME TO VISIT OUR FACTORY.         Any further question, pls feel free to tell us, and we are very glad to be at your service!   Contact: Serena Lee(Ms)   Sales Manager Dengfeng City Yuhao High-temperature Component Co., Ltd Add: Sanlizhuang High&New Tec. Zone, Dengfeng City 452483,             Henan Province, China(Mainland)  Web:  https://hnyuhaoheater.en.alibaba.com/  Mobile: 86-15937181552/ Fax: 86-371-62755222 Skype: serena521818  What's app: +86 15937181552.