Heat Treat Alumina Ceramic Tube
Description
Technical Parameters
Products Description
Heat treated alumina ceramic tubes are made of alumina ceramics, also known as corundum ceramics, which are ceramics with α - AL2O3 as the main crystal phase. There are different series based on the different contents of AL2O3 and additives. For example, according to the different contents of AL2O3, it can be divided into 75%, 85%, 95%, 99%, etc.; According to their main crystal phases, they can be divided into mullite ceramics, corundum, mullite ceramics, and corundum ceramics; Divided into chromium corundum, titanium corundum, etc. According to customer needs, different shapes can be made by using different main crystal phases and alumina contents.
99%
99 alumina ceramic materials are used to make high-temperature crucibles, refractory furnace tubes and special wear resistant materials, such as ceramic bearings, ceramic seals and water valve plates.
95%
95 alumina ceramics are mainly used for corrosion-resistant and wear-resistant parts.
85%
85ceramics can be sealed with metals such as molybdenum, niobium, and tantalum, and some are used as electric vacuum devices, because part of talc is often mixed into it, 85 ceramics are improved the electrical properties and mechanical strength.
Heat Treat Alumina Ceramic Tubes' Material Properties
Alumina ceramics are one of the most chemically stable and mechanically strong materials among refractory oxides; Alumina ceramics do not react with most molten metals, only Mg, Ca, Zr, and Ti have a reducing effect on them above a certain temperature; Hot sulfuric acid can dissolve alumina, while hot HCl and HF also have a certain corrosive effect on it; The vapor pressure and decomposition pressure of alumina ceramics are the lowest.
The heat treat alumina ceramic tube protective casing is mainly used for supporting thermocouple/thermal resistance assort. To product the normal operation of thermocouple and thermal resistance, please pre-installed on various devices which are inconvenient disassemble under pressure.
Different materials of protective casing are used to resist and corrosion of temperature measuring elements by different media. The working temperature of corundum casing can reach 1600℃, and the high lead casing can reach 1400℃. The product meet standards:GB2935-1982,JC 508-1994. Can be customized according to user requirements.
product photos of the Heat treat alumina ceramic tube
Application areas of Heat Treat Alumina Ceramic Products
Industrial field
Steel industry: conveying system, batching system, sintering system, steel ball coal mill, medium speed coal mill, dust removal and ash removal system, powder conveying system, coking system
Cement industry: limestone crushing system and raw material pre homogenization system, raw material grinding system, fuel mill (steel ball mill), sintering system, cement grinding system
Smelting industry: feeding system, batching system, roasting system, dust removal system
Mining and processing fields
Mining: Feeding system: hoppers, silos
Dust removal system: dust removal pipeline, elbow, fan housing and impeller, cyclone separator
Processing equipment: vibration grinding inner lining
Coal industry: Coal conveying system: chutes, hoppers, silos
Coal washing and selection system: pressure cyclone, non pressure triple product heavy medium cyclone, non pressure quadruple product heavy medium cyclone, centralized cyclone group: conveying system: pipeline, elbow, pipeline, hopper, silo, sorting port
High temperature processing field of heat treatment
Alumina ceramics have also played an important role in the manufacturing of high-temperature furnaces, high-temperature pipelines, aerospace components, and other fields.
In the power industry, alumina ceramics are used as electrical insulation materials and shell materials for high-voltage switches
crucible
Other fields
Textile Industry: Wire Rod
Ceramic industry: pads, hangers, fixtures
Shape types of heat-treated alumina ceramic
1. Crucible Box
Specification:
According to shape of crucible box, it can be divided into many shapes, such as rectangle, square, cylinder, arc, cone, ellipse and special shape. Divided by volume, it can range from 5ml to 2000ml. The shape, size and temperature resistance requirements depends on the actual application requirements of the customer. So it can be arbitrarily selected and has strong applicability. Mullite crucible is suitable for precision casting of black and gray, die-casting of various alloys, casting of gold ,silver , and metal jewelry, and other industries.
Product Usage：
Crucible box is widely used in coal quality testing, metal smelting, building materials industry, machinery manufacturing, powder metallurgy and other industries, because it the characteristics of fine structure, low thermal conductivity, small thermal expansion coefficient, high dimensional accuracy of finished products, no deformation at high temperature, good thermal shock stability, good electrical properties, and good chemical corrosion resistance. It is a container for melting, refining metal liquids, solid-liquid heating and reaction, and is the basis for ensuring the smooth progress of chemical reactions.
Characteristic:
Heat treated alumina ceramic furnace tubes have corrosion resistance, oxidation resistance, leak prevention, and good vacuum performance at high temperatures. Uniform wall thickness, good straightness, small tolerance, and high insulation. It is suitable for use between 1650 and 1750 degrees.
Product Usage:
The purpose of heat-treated alumina ceramic furnace tube is to serve as a lining for various experimental electric furnaces, mainly to separate the heating element from the material to be burned, seal the heating area, and place the material to be burned. It is made with advanced technology and then finely fired at 1780 degrees for 8 hours.
Common selection range of furnace tubes:
|
Wall thickness |
Length |
Bore |
|
|
Size range(mm) |
3mm~15mm |
100mm~2000mm |
5mm~200mm |
3. Mullite Ceramics
Introduce:
Mullite Tube service temperature can reach 1450 degrees, with low mechanical strength and strong thermal shock resistance. It can be used up to 1200℃ in BaCl2 melt. its corrosion resistance to molten metal, combustible gas, metallic oxide and alkali is not good. Normally, it should be installed vertically, when installed horizontally, it should be supported. It is suitable for high temperature ceramics, heat treatment and glass industries.
Characteristic:
Mullite saggar has features of no free silicon, no kaolin, no activated alumina, long service life and small thermal expansion coefficient.
Main features are high temperature bearing capacity, high operation temperature, good thermal stability.
comparison of product parameters
|
Physical and chemical indicators |
Unit |
cordierite combined with mullite |
Mullite combined with aluminum spinel |
Corundum Mullite I |
Corundum Mullite II |
|
|
AL2O3 |
% |
>50 |
70 |
≥70 |
≥85 |
|
|
SiO2 |
% |
43 |
||||
|
MgO |
% |
5.0 |
12 |
|||
|
Bulk density |
g/cm3 |
2.15 |
2.7 |
2.4-2.7 |
2.7 |
|
|
Apparent porosity |
% |
22 |
22 |
|||
|
Flexural strength(20℃) |
MPa |
16 |
||||
|
Flexural strength (1250℃) |
MPa |
13 |
||||
|
load softening point(0.6%) |
℃ |
1420 |
||||
|
Thermal shock stability 1100℃ water cooling |
times |
>25 |
||||
|
Max operating temperature |
℃ |
1350 |
≤1400 |
≤1500 |
||
4. Mullite Brick
Mullite brick is a high alumina refractory material with mullite (3Al2O3 2SiO2) as the main crystal phase. Generally, the alumina content is between 65% and 75%. Mineral composition of mullite bricks expect mullite, those lower contain of alumina also contain small amount of glass phase and cristobalite, those with higher alumina content also contain a small amount of corundum. It with High refractoriness, temperature above 1790℃, Under load softening start temperature 1600 ~ 1700 ℃. Normal temperature compressive strength is 70~260MPa. The heat shock resistance is good. It mainly used for hot blast stove top, blast furnace shaft and bottom, window top, glass melting furnace regenerator, ceramic sintering kiln, dead angle lining of petroleum cracking system, etc.
Physical Properties
|
Properties |
Technical parameter |
|
Bulk density(g/cm3) |
≥2.9 |
|
Refractoriness |
≥1800℃ |
|
Apparent porosity% |
≤20 |
|
Thermal expansion coefficient×10-6/℃ |
8.6 |
|
Thermal shock resistance 1300℃ water cooling times |
≥15 |
Products DescriptionProduct Quality Certification
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