Hello, welcome to the official website of Liaoning Hongyu Refractories Group Co., Ltd.
Liaoning Hongyu refractory Group Co., Ltd.
Address: two room village, Guan Tun Town, Dashiqiao, Liaoning, China
Web site: www.hy-ref.com
Contact: high general
Zip code: 115100
1. The plasticity of refractories
Plasticity refers to the property that the shape changes but does not crack when the refractory is modulated to the specified consistency and the diluent, when it is subjected to the external force. Generally speaking, all refractories doped with binders have certain plasticity. Refractories can be plastic, tamping, clay or some binder, which have obvious plasticity, but the plasticity of semi dry molded products with mechanical pressure is very poor.
2. Cohesiveness of refractory materials
Refractory bricks need to be bonded at room temperature and high temperature, so refractory mud is usually used. Siliceous, cohesive, high alumina, magnesia refractory slurry, at room temperature, interacts with intermolecular forces to achieve adhesion between refractory products. Ceramic bonding can be achieved in the high temperature environment due to sintering. In order to achieve ceramic bonding at lower temperature, some sintering can be added in the mud.
3, the resilience of refractories
The resilience of refractories is for spray coating. When the spraying construction is carried out, the waste of the refractory spray coating and the particle size distribution of the spray coating are often caused by the springback of the aggregate particles, and the volume density decreases, so that the service life of the lining layer is affected.
4. Consistency and flooding of refractories
(1) consistency is used to indicate the flowability of refractories. The concept of consistency is widely used in refractory slurry, castables, plasticity and some wet spraying coatings. Use the specified metal cone to sink into the flowing material. The depth of penetration is the consistency of the material and 0.1mm is the unit of measurement.
The adjustment of consistency is mainly achieved by adjusting the particle size distribution of the material and the ratio of binder and diluent. The consistency index can also be adjusted by adding a proper amount of water reducing agent.
(2) Pan pulp refers to the phenomenon of a layer of slurry on the surface of a refractory concrete during construction due to vibration and ramming. It is mainly due to the continuous sinking of aggregate particles.
When the multi-layer refractory castable with large volume or thickness is used for construction, the first layer of material will be cracked and second layers of material should be broken. Because the surface of the pulp layer is more light, it is easy to cause thickness stratification.
5. Hardening time of refractories
Hardening is the mechanical strength of a structure formed after the physical and chemical changes between the refractory and the binder, under certain external environmental conditions.
A variety of amorphous refractory material, under the action of cementing agent, without high temperature sintering, as long as it meets its specific requirements, can achieve chemical or physical integration to achieve refractory material hardening and have high strength. If all kinds of refractory cement are mixed with refractory aggregate, powder and water, after a period of curing and continuous hardening, the strength will increase continuously. In the process of temperature drop, the original liquid phase glass or the crystal activity is reduced, and the hardening process is achieved.