二硅化鉬電熱元件（硅鉬棒）
Mosi₂Heating Elements

　　二硅化鉬電熱元件是一種以硅化鉬為基礎的電阻發(fā)熱元件，其在氧化氣氛下加熱到高溫，表面生成一層致密的石英玻璃膜，保護其不再氧化。因此，其具有獨特的高溫抗氧化性。在氧化氣氛下，其最高溫度可達1800C，其適用溫度500-1700℃，可以用作陶瓷、磁性材料、玻璃、冶金、耐火材料等工業(yè)高溫爐的加熱元件。

　　二硅化鉬電熱元件的機械性質和其它陶瓷制品樣，在常溫下屬于脆性材料容易斷裂，這給運輸和安裝帶來了一定的困難，但只要安裝合理和使用得當是可以避免的。

　　 Mosi₂ , heating element is a kind of resistance heating element basically made of high pure Molybdenum Disilicide. In oxidizing atmosphere,a layer of compact quartz protective film is formed on the surface of Mosi₂, element owing to the hightemperature combustion, which prevent Mosi₂, from continuously oxidizing. In oxidizing atmosphere, its Max temperature can reach 1800℃, and its applicable temperature is500-1700℃. It can be widely used in such applications as sintering and heat treatment of ceramics, magnet, glass, metallurgy, refactory, etc. The commercial name of our MoSi₂, heating elements is Yandi Super Heating Elements.

　　Having the same mechanical character as other ceramic products, MoSi₂, heating elements are brittle materials so that they are easy to rupture at the noumal temperature at the normal temperature, which brings some difficulties to transport and install, but it may be avoided if they were installed and used correctly.

二硅化鉬電熱元件的標志法Dimension marks of elements

硅鉬棒在各個領域，所使用尺寸和形狀均根據(jù)實際情況定制。您在定制時建議使用以下標志法:

材料等級：1700（MS17型號），1800（MS18型號）
直徑：D1/D2，mm/mm
熱端長度：Le，mm
冷端長度：Lu，mm
間距：A，mm

例如：
U型，材料等級1800，D1=3mm，D2=6mm，Le=140mm，Lu=125mm，A=25mm 表示為MS18，U型，3/6×140×125×25
W型，材料等級1700，D1=6mm，D2=12mm，Le=300mm，Lu=250mm，A=50mm 表示為MS17，W型，6/12×300×250×50

Material Grade：1700（MS17Model），1800（MS18Model）
Diameter：D1/D2，mm/mm
Hot zone length：Le，mm
Cold end length：Lu，mm
Shank Spacing：A，mm

Examples:
UShape，Material Grade 1800，D1=3mm，D2=6mm，Le=140mm，Lu=125mm，A=25mm Specify as：Yandi Super MS18，UShape，3/6×140×125×25
WShape，Material Grade 1700，D1=6mm，D2=12mm，Le=300mm，Lu=250mm，A=50mm Specify as：Yandi Super MS17，WShape，6/12×300×250×50
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二硅化鉬電熱元件的理化性質　Physical and chemical properties of elements

1、物理性質Physical properties

2、化學性質Chemical properties

　　高溫抗氧化性：高溫氧化氣氛下，元件的表面生成一層致密的石英（SiO₂）保護層以防止MoSi₂繼續(xù)氧化。當元件溫度大于1700℃，熔點為1710℃的SiO₂保護層熔融，由于表面的張力的作用，SiO₂熔聚成滴，而失去保護作用。元件在氧化氣氛下，再繼續(xù)使用時，SiO₂保護層重新生成。
　　必須指出的是元件不宜在400-700℃范圍內長時間使用。否則元件會因低溫的強烈氧化作用而粉化。

　　Oxygen-resistance under high temperature:in oxidizing atmosphere，a layer of compact quartz（SiO₂）protective film is formed on the surface of element owing to the high-temperature combustion，which prevent MoSi₂，form continuously oxidezing.When the element temperature is higherthan 1700℃，the SiO₂ protective film will be fused because its fusing point is1710℃ and the SiO₂ is fused into molten drops owing to the action of its surface extension, which cause losing its protective ability. In the oxidizing atmosphere, when the element is continuously used, the protective film forms again.
　　It should be pointed out that element cannot be used for rather long time in 400-700℃, otherwise, it will be powdered owing to the strong oxidizing action in lov temperature.

3、不同氣氛對元件溫度的影響The Max temperature of elements in different atmospheres

二硅化鉬電熱元件的電氣性質Electric properties of elements

1.電阻特性Resistance properties

1700等級和1800等級元件的電阻-溫度曲線
　　二硅化鉬電熱元件的電阻率隨著溫度的升高而迅速增加。在正常操作情況下，元件電阻一般不隨使用時間的長短而變化。因此，新舊元件可以混合使用。
RESISTANCE VS.Element Temperatuer for Yandi Super MS17 and MS18 Elements
　　The resistivity of elemenet rapidly rises along with the temperature rises, under normal operating conditions, generally the element resistance does’t change with the application time changing. So the old and new elements can be used together.

2.表面負荷 Surface load

　　根據(jù)爐子的結構、氣氛和溫度正確地選擇元件的表面負荷是達到最好元件壽命的關鍵。右圖示出了元件輻射在不受阻礙情況下的爐溫、元件溫度與表面負荷間的關系，陰影部分為常用的表面負荷-溫度范圍。

　　The key factor to the optimum service life of the element is to select the surface load of the element correctly cccording to the furnace consteuction, atmosphere and temperature. Right figure shows the relation between the furnace temperature, the element temperature and the element surface load under the condition that element radiation isn’t obstructed. The shadow part in the figure shows the surface load-temperature range in common use. The figure still shows the reference current.

推薦的表面負荷 Recommend surface load：

二硅化鉬電熱元件的安裝 Installation of elements

1.垂直懸掛Vertically hanging

二硅化鉬電熱元件常溫下脆性很大，高溫時又有可塑性。所以U型元件的安裝方法是垂直懸掛。通過固定夾將元件懸掛在爐頂上。這樣安裝的目的就是避免將機械應力加到元件發(fā)熱端上，否則容易引起元件斷裂。
　　Under normal temperature，Mosi，element is very brittle，while under high temperature it is plasticity.So，the better way for installation of the U Shape element is to hang it vertically to the furnace top by the element holder.Such way is to avoid putting the mechanical stress directly to the element heat-generating end，otherwise，the element will easily be broken.

2.固定夾 Element holder

　　整個元件的重量都是由固定夾承擔，元件的位置也由它決定。因此，必須仔細安裝，保證元件垂直懸掛。為避免局部過熱，元件下端圓錐部分一定要伸到爐膛內。
　　The element holder supports the whole weight of the element and the position of the element is also determined by it.Therefore，it must be installed carefully to assure that the element is vertically hung.In order to prevent the element form being over heated locally，the taper part of the element lower end must put into the furnace chamber.

3.連接帶Connection strap

　　接觸元件的連接導線采用鋁編織帶或多層鋁箔。外面的夾子只起夾緊作用，不用來導電。導線的末端與母線連接。為了避免應力傳到元件上，導線長度應略大于元件和母線間的直線距離。

　　安裝元件時夾頭上的螺絲不要一次擰的太緊，待元件升到高溫時再次擰緊，因為這時元件有一定可塑性不易折斷。夾頭部分溫度一般不要高于200℃。因此，夾頭導線與元件接觸電壓應降低0.1V。為避免輻射熱傳到夾頭，夾頭下端和穿磚上面的距離不應小于50mm。為了避免損壞，一般直徑6/12mm元件不能長期使用170A，直徑9/18mm元件不能長期使用300A。

　　The connection starp is made of aluminum braid strap or multi-layer aluminum foil.The outside clamp isn’t used for electrical conduction.The end of strap contacts bus，and the length of strap should be a little larger than the linear distance between the element and bus.

　　When install the element, don’t fix the strap too much at one time, it can be tightened shen the element rises to high temperature, as the element has some plastic and isn’t easily broken. The temperature of the wrie clip generally should’t be higher than 200℃. Therefore, the contact voltage between the clip wire and element should be lowered to 0.1V. In order to avoid that the radiation heat is conducted to the clip, the distance betweenthe lower end of the clip and upper surface of the thourgh brick should not less then 50mm. Generally for Φ6/12 element,170A should not be used long time and for Φ9/18 element,300A shouldn’t be used for long time.

二硅化鉬電熱元件的附件Accessories of element

二硅化鉬電熱元件的標準附件包括元件固定夾和兩條帶有夾子的鋁編織連接帶。用于不同直徑元件的
附件如下：

　　The nominal accessories of MoSi2 elements includethe element holder and 2 aluminum braid connecting straps.The accessories for different diameter elements are the following.null

二硅化鉬爐子的操作Operation of MoSiz furnace

1.爐子的干燥Drying of the furnace

　　新砌筑或長期不用的爐子在使用前需要干燥。一般干燥溫度為100-200℃，而元件長期在低溫下使用將會引起低溫氧化。小型爐子干燥時間短，幾個小時對元件影響不大。大型爐子干燥時間長，需要注意。為了通風，最好將爐門打開，隨著溫度升高可以半開，到1000℃以上完全關閉爐門。

　　The new built furnace or the furnace that haven’t been used for a long time should be driedbefore operation. The drying temperature generally is 100-200℃. The element that has been used for a long period under low temperature will cause low-temperature oxidation. For the small-sized furnace, as its drying time is short, several hours will affect the element little, but for the large-sized one,as its drying is long, it should be dried carefully.You’d better open the furnace gate to make it ventilated. The gate may be half-opened with therising of temperature and fully closed when the temperature rises above 1000℃.

2.爐子的啟動Starting of the furnace

　　如果爐子干燥好了或不需要干燥就可以啟動升溫，為了避免過大電流沖擊而使電器設備過荷，應采用下列步驟起動：

　　If the furnace has been dried or needn’t to be dried, then it may be started to raise temperature. In order to avoid that it is impacted by over current and the electric device is overloaded, the following steps should be adapted:

3.元件的更換Re3placing of element

　　在操作過程中發(fā)現(xiàn)元件損壞應首先確定位置，同時準備好組合元件。然后將損壞的元件夾頭導線與母線連接的螺絲松開，清理開陶瓷棉，連用穿磚一起拔出來，再將新組合元件從爐頂插入，連接好導線，堵好陶瓷棉即可升溫。

If it is found that one element is damaged during operating, firstly, you should determine where it is, at the same time prepare a made up one. Then loosen the thread which links the lead wire of the damaged element and the bus, clear out the ceramic cotton and pull out the through-brick. Afterward, insert the new element from the furnace top, link the lead wire, block the gap with ceramic cotton and start to raise temperaturenull

二硅化鉬電熱元件參考數(shù)據(jù) Reference data for Yandi Super heating elements

1、1800等級3/6mm的U型元件
1800 Grade U type 3/6mm elements

2、1800等級4/9mm的U型元件
1800 Grade U type 4/9mm elementsnull

3、1700等級6/12mm的U型元件1700Grade U type 6/12mm elements

4、1800等級6/12mm的U型元件1800Grade U type 6/12mm elements

5、1700等級9/18mm的U型元件1700Grade U type 9/18mm elements

6、1800等級9/18mm的U型元件1800Grade U type 9/18mm elements

7、1700等級6/12mm的W型元件1700Grade Wtype 6/12mm elements

8、1700等級9/18mm的W型元件1700Grade W type 9/18mm elements