Silicon Nitride Si3n4 Bonded Silicon Carbide Sic Tube for Thermocouple Protection

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Qingdao
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TT OR LC
Min Order Qty:
5 m.t.
Supply Capability:
500 m.t./month

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Product Description:

Si3N4 bonded SiC ceramic refractory material, is mixed with high pure SIC fine powder and Silicon powder, after slip casting course, reaction sintered under 1400~1500° C. During the sintering course, filling the high pure Nitrogen into the furnace, then the silicon will react with Nitrogen and generate Si3N4, So Si3N4 bonded SiC material is composed of silicon nitride (23%) and silicon carbide(75%) as main raw material, mixed with organic material, and shaped by mixture, extrusion or pouring, then made after drying and nitrogenization.

Si3N4 bonded SiC as a new type refractory material, is used widely. The applying temperature is 1400 C. It has better thermal stability, thermal shock, which is better than plain refractory material and recrystallized SiC. It also has antioxidation, high corrosion resistant, wear-resistantance, high bending strength. It can resist corrosion and scouring, be no polluted and fast heat conduction in molten metal such as AL, Pb, Zn, Cu ect.

Please check below specification:
The diameter of Si3N4 bonded SiC thermocouple protection tube is Φ 12-80mm, length is 1600 mm. It can be usded in high temperature kiln furnace and all kinds of atmosphere. It also can be directly used in all kinds of melted liquid.
Liquid tube, heating sheath, protection tube: Used in aluminum liquid and glass liquid. It has good thermal conductivity, corrosion resistance, compression resistance, long lif ect.
Roller tube: Used in brickkiln furnace on the ground, diameter Φ 30-50mm, length within 1600mm, high temperature resistance, no deformation, high strength
4. Kiln furniture: Used in tunnel kiln, shuttle kiln, down draught kiln, with good carrying capacity. It is ideal kiln furniture for increasing output of kiln furnace and make good use of space of kiln furnace.
5. Sagger: Used for firing high grade refractory material, rare metal, powder metallurgy, electronic components and various loose material. Shape can be canister and rectangle.
6. Various refractory piece: With impact resistance, high temperature resistance, wear-resistance, good thermal shock resistance ect. Suitable for heat exchanger, cold air pipe, burner nozzle, crucible.
It can not only gain energy-saving effect, but also can keep product from pollution, and long life and convenient operation if you choose Si3N4 bonded SiC.

The physical and chemical performance of Si3N4 bonded SiC:


Item

Index

Compressive strength Mpa

> 120

Bending strength Mpa

> 40

Vol. density g/cm³

2.4

Porosity %

20

Thermal conductivity (1200 °C) W/M °C

15

Thermal shock 1000°C-20°C

> 20 times

Resistivity

10 4

Moh's hardness

> 9

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Q:What are the reasons for the spalling of refractory bricks in the production of lime kiln?
In the course of the production of lime kiln, the local block of refractory brick is a very dangerous signal. It is suggested that you stop the kiln to prevent the collapse of a large area. Lime kiln is the main equipment for the production of limestone kiln and rotary kiln is two, with the growth of calcium carbide lime kiln industry, iron and steel industry, the construction industry to the amount of limestone has become the main production equipment, and refractory bricks became the heart of lime kiln.
Q:What is the heat preservation material used in a laboratory furnace?
Silicon carbide (SiC) is made from quartz sand, petroleum coke (or coal tar), sawdust (green salt produced when adding green silicon carbide) and other raw materials by smelting with resistance furnace at high temperature. Silicon carbide also rare minerals in nature, Mo sangshi. Silicon carbide, also known as carbon silica. Silicon carbide is the most widely used and the most economical kind of refractory materials in C, N, B and other non oxide refractory materials. It can be called "carborundum sand" or "refractory sand".
Q:What is the content of free silica in the refractory bricks of high alumina bricks?
Refractory powders are not rich in free silica in varying degrees
Q:How can the refractory brick blast furnace be pulverized and pulverized enough not to be taken away by the wind?
Top burning type hot blast stoveIt means that the burner is installed on the top of the hot blast furnace of the iron making equipment, and it does not need a special combustion chamber in the vault space. It is also called a non combustion chamber type hot blast stove.
Q:High alumina brick 80 with which high aluminum cement?
In order to maintain a reasonable comprehensive lining, should adopt high quality aluminum refractory mud, such as Sichuan resistance card phosphate refractory mud, refractory clay, high alumina refractory mud PA-80 LN-75, if you use the card volume of Sichuan resistant refractory clay masonry, the effect is better.
Q:What is the difference between corundum and high alumina??
The difference between them lies in the content of alumina and the alumina refractory products with alumina content higher than 48%The content of Al2O3 is higher than 90%, which is called corundum brick.
Q:What is spalling resistant high alumina brick?
Using bauxite as main raw materials, the introduction of a small amount of ZrO2 (ZrO2 is due to phase transition, between monoclinic and tetragonal type can improve the thermal stability of the products), adding a certain amount of binder and additives, the particle size distribution control mud, forming and sintering of refractory products produced, called anti stripping high alumina brick.
Q:Application characteristics of high alumina brick
Load softening temperature. The softening temperature of high alumina brick products decreases with the increase of silica and alkali metal oxide content, but is higher than that of clay brick products, which is about 1420 - 1530 degrees centigrade. Al2O3. The softening temperature of corundum brick with content greater than 95% can reach above 1600 DEG C.
Q:Aluminum content 38. silicon content 55 What refractory bricks?
High alumina brick:The mineral composition of the high alumina brick is determined by the bauxite used. The mineral composition of the clinker is usually mullite, corundum and glass. The theoretical composition of mullite is Al2O371.8%, SiO2 28.2%, and its melting decomposition temperature is 1840 DEG C. With acicular crystal, network cross structure, high temperature state showed better strength. Corundum in the form of alpha -Al2O3, melting point of 2050 degrees, hardness of Mohs 9, showing a granular and columnar crystal, has good chemical stability, acid, alkaline slag have a certain resistance. Based on the composition of mullite minerals, the phase composition of high alumina brick can be judged according to the content of Al2O3. When the bricks are below Al2O3 71.8%, the base of the composition is mullite and SiO2, such as grade LZ-48 bricks. Because it contains a large number of SiO2 formed in the liquid phase under high temperature is 20% ~ 30%; brick in Al2O3 more than 71.8%, the excess Al2O3 formed corundum crystal under high temperature, while generating 2 high temperature phase, eutectic temperature rise by the low content of Al2O3 brick 1595 C to 1840 C, such as grade LZ-75 brick. In fact, it is impossible to produce a complete phase equilibrium in the process of production, but the glass phase is very small, and there is no more than 10% in the partial gap of the Yu Jing phase
Q:What are the lining structures of lime rotary kilns and what are the requirements for refractories?
The rotary kiln lining structure of rotary kiln and requirements on refractories calcining active lime according to the general output is divided into Nissan 300t, 400 t, 600 t, 800 t, 1000 t, 12000 t of kiln type, calcining zone temperature at 1350 degrees celsius. The kiln is divided into a discharge end, a cooling zone, a burning zone, a preheating zone and a feeding end, and the temperature of each section of the kiln ranges from 1000 DEG C to 1350 DEG C, and the requirements for refractory materials are different. The kiln refractory materials not only to withstand the high temperature impact, but also need to bear the material erosion, kiln rotation stress produced, so not only on the physico-chemical properties of refractory materials have strict requirements, but also for the construction of brick should be strictly.

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