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Types of wear-resistant ceramic pipe and its application in industrial production - aakfk2665s - 08-26-2021
Including abrasion resistant ceramic pipe elbow, straight pipe , structural tee, head size, radius sections , adjustable pipe , mainly used for the air force , pumping slurry pipeline and other materials . Because the transmission medium with high hardness, flow speed , flow characteristics, can effectively reduce the transmission medium to the wall to produce long-lasting impact, abrasion , corrosion fatigue causes the pipe was gradually worn out speed.
1 , the definition of wear-resistant ceramic pipe
Depending on the working conditions of wear on the wear-resistant ceramic pipe lining materials have different choices. Resistant ceramic lined pipe ( lining of aluminum oxide , silicon carbide , zirconia, silicon nitride , sialon , aluminum nitride, boron nitride , etc. ) ; resistant alloy tube ; hexsteel wearable pipe fittings ; rubber resistant steel grinding tube ; wear-resistant plastic tube ; wear-resistant cast stone pipe ; wearable self-propagating composite pipe ; rare earth alloy wear-resistant pipe.
2 , the main application of wear-resistant ceramic pipe
In addition to used in coal-fired power plants wear elbow ash , slag pipe , powder , powder tube back , desulfurization pipes , but also widely used in the following industries:
Mining : Coal industry CWS , washing mud , mine backfill , mine coal powder ;
Metal mines : concentrate and tailings transport wear elbow ;
Metallurgy : Steel mill blast of pulverized coal injection , slag and other transmission pipelines ; CAO, zinc Bei sands pipeline , transporting steel alloys, refining , etc. Preferably wear elbow ;
Cement : raw slurry wet rotary kiln production line conveyor , coal transportation, upgrading cutting machine , pneumatic conveying finished unloading cement , concrete wear elbow .
Chemical : pulverized coal pipeline , transporting raw materials such as silica fume wear elbow .
The main application sectors 3 , wear-resistant ceramic pipe
In addition to used in coal-fired power plants wear elbow ash , slag pipe , powder , powder tube back , desulfurization pipes , but also widely used in the following industries:
Mining : Coal industry CWS , washing mud , mine backfill , mine coal powder ;
Metal mines : concentrate and tailings transport wear elbow ;
Metallurgy : Steel mill blast of pulverized coal injection , slag and other transmission pipelines ; CAO, zinc Bei sands pipeline , transporting steel alloys, refining , etc. Preferably wear elbow ;
Cement : raw slurry wet rotary kiln production line conveyor , coal transportation, upgrading cutting machine , pneumatic conveying finished unloading cement , concrete wear elbow .
Chemical : pulverized coal pipeline , transporting raw materials such as silica fume wear elbow .
4, the detailed use of wear-resistant ceramic pipe
Transport has been around electricity, metallurgy, coal , petroleum, chemicals, building materials , machinery and other industries, and high-speed developing. When the wear-resistant ceramic grinding large pipeline materials (such as ash , coal , ore concentrates , tailings, cement, etc. ) , there is an abrasion resistant ceramic pipe faster , especially wear elbow faster. When the pipeline in the wear-resistant ceramic having a strong corrosive gas , liquid or solid , there is a problem of corrosion and wear-resistant ceramic pipe is quickly destroyed . When the pipeline resistant ceramic materials with higher temperatures , there is a heat-resistant steel prices are very expensive problem. After resistant ceramic pipe market, these problems are solved. Wear resistant ceramic pipe is widely used in mine backfill serious , transporting ore concentrate and tailings , coal-fired power plant feed powder , slag , ash and other wear-resistant ceramic pipes are also very suitable . Resistant ceramic pipes are transported strong corrosive acid, alkali , salt and abrasive both solid , wear-resistant ceramic pipe ideal liquid delivery . In the high-temperature corrosion resistant ceramic pipe , high temperature or high-temperature ablation wear occasions using very safe and reliable.
5 , wear-resistant ceramic pipe production technology
Resistant ceramic pipes are using self- propagating high temperature synthesis - centrifugation manufacture. After that is placed inside the centrifuge tube seamless steel mold , joined in the steel and aluminum oxide powder mixture , the mixture called thermite in chemistry , centrifuge tube mold rotation reaches a certain speed , through a Mars ignite thermite , thermite now own , the combustion wave spread rapidly , following violent chemical reaction occurs when the spread.
Chapter One – What are Alumina Ceramics?
Alumina Ceramic Liner is an industrial ceramic that has high hardness, is long wearing, and can only be formed by diamond grinding. It is manufactured from bauxite and can be shaped using injection molding, die pressing, isostatic pressing, slip casting, and extrusion.
Products made from alumina, some of which are shown in the image below, are wear, chemical, erosion, corrosion, and high temperature resistant and bioinert, making them perfect for medical implants.
Alumina ceramics are a technical ceramic due to their properties and price to performance ratio. The classification of alumina ceramics is based on their alumina content, which can vary from 70% to 99.9%. The higher the purity of alumina, the stronger is its wear and corrosion resistance.
Chapter Two – Properties of Alumina Ceramics
Alumina ceramics are made from a white granular material that is similar to table salt or a very fine silky dense powder. The three general types of alumina are hydrated, calcined, and tabular. Each type has a variety of grades.
The types of alumina vary according to the amount of soda (Na2O), iron (Fe2O3) and silica (SiO2) they contain as well as their chemical purity and the properties of the powder used in the production process.
Calcined:
To produce calcined alumina, aluminum oxide is heated to 1050° C or 1900° F. The super heating removes all chemicals and water creating a very pure, 99.99% pure, with a 9 on the Mohs hardness scale, which is just below a diamond’s Mohs rating of 10.
Hydrated:
Alumina hydrate, or alumina hydroxide, is used as a glaze because of its ability to stay in suspension in glaze slurries and adhesive qualities.
Tabular:
Tabular alumina is produced by heating aluminum oxide to 1650° C or 3000° F. It has a high heat capacity, excellent thermal temperature, strength, and volume stability. It is formed from sintering balls of calcined alumina, which are crushed to form a powder. Tabular alumina has high refractory properties, mechanical strength, wear resistance, chemical purity, dielectric properties, and corrosion resistance in acids and alkaline.
Properties of Alumina
High Temperature Ability
Alumina is used in oxidizing and reducing atmospheres up to 1650°C or 2900°F as well as vacuum environments of 2000°C or 3600°F. At 1000° C, it keeps 50% of the tensile strength it has at room temperature. While metals are weakened by high temperatures, alumina ceramics retain their strength when they return to normal temperatures and are unchanged.
Abrasion Resistant
Abrasion wears down a material by rubbing it away by friction. The resistance to abrasion means a material will maintain its original structure even after mechanical wear. Alumina ceramics are high in abrasion resistance due its hardness.
Chemical Resistance
Alumina is resistant to acids and alkalis at high temperatures because it is inert, not chemically reactive, which makes it resistant to the effects of chemicals such as solvents and salt solutions.
Density
The density of a material is its mass divided by its volume, which is read as grams per cubic centimeter (g/cm3) where grams is mass and cubic centimeters is volume. As the volume increases, the density of the material increases. Alumina ceramics are made from fine particles that do not allow for voids in the material. The fewer voids means the material has high volume and density. The density of alumina ceramics varies according to the temperature. At 25° C, its density is 3.965 g/m3 at standard atmospheric pressure.
Mechanical
The mechanical properties of a material is determined by its strength, which is the amount of stress and strain it can endure. Alumina has superior strength and hardness that improves with the purity of the different grades.
Thermal
Alumina has high resistivity and reduces thermal shock. The increased purity of alumina increases its resistivity.
Dielectric
Alumina ceramics make a perfect insulation material because of its dielectric equality, the inability of an electric current to pass through them.
Hardness
Hardness tells the ability of a material to be able to endure mechanical wear and abrasion. Alumina ceramics are harder than steel and tungsten carbide tools. They are harder than sapphire and are excellent for mill linings and bearings. According to Rockwell hardness, alumina ceramics are at HRA80-90, second only to diamonds and above stainless steel.
ZTA ceramic liner is zirconia toughenedalumina ceramic liner ，belonging to inorganic non-metallic materials, is a good wear-resistant materials. Zirconia toughening alumina ceramic is added pure 99 Zr02 zirconia, the particles form ZrO2 toughened alumina ceramic. Alumina toughness can be significantly improved when zirconia is added as appropriate. It can be said that the toughening of alumina ceramics is the toughening method most used at present, and about 20% zirconia (ZrO2) is added to toughen the alumina.
ZTA toughening effect mainly comes from the following mechanism:
(1) to make the aluminum oxide grain refinement.
(2) Zirconia phase change toughening.
(3). Micro-crack toughening.
(4). Crack steering and bifurcation. Zirconia toughened alumina mechanical properties: ZTA
(zirconia toughened alumina) ceramic density > 4.1, Rockwell hardness > 90, Vickers hardness >
1300, fracture toughness 6.0, flexural strength 480MPa, compressive strength 3600MPa, ZTA toughening alumina ceramic liner is added on the basis of alumina zirconia ceramic ingredients, abrasion resistance and toughness between the alumina ceramic and zirconia ceramics, zirconia ceramics because the higher prices, the user once The larger the amount investment, the largest number of manufacturers are mostly European and American companies and BHP Billion and other groups.
What is Concrete Pump Pipe?
Concrete pump pipeline is used with concrete pumps to ensure that the concrete is delivered correctly and safely to where it needs to be. It's an essential part of truck-mounted concrete pumps, trailer pumps, or placing booms. The concrete pump pipe is the most wearing component on a concrete pump as it has the biggest contact and the most friction with the concrete. The durability of pipes is one of the major factors to the pumping efficiency.