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Method for synthetizing fused cast by combustion of MgAl2O4 ceramic

A technology of combustion synthesis and mgal2o4, which is applied in the field of combustion synthesis and casting of MgAl2O4 ceramics, can solve the problems of environmental pollution, high cost of ceramics, complex process, etc., and achieve the effects of high purity, short preparation cycle and simple experimental process

Active Publication Date: 2013-09-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is to solve existing MgAl 2 o 4 The cost of ceramics is high, the process is complicated, and there are technical problems of environmental pollution, and a MgAl 2 o 4 Method of Combustion Synthesis and Casting of Ceramics

Method used

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Experimental program
Comparison scheme
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specific Embodiment approach 1

[0013] Specific embodiment one: a kind of MgAl of this embodiment 2 o 4 The method for the combustion synthesis melting and casting of ceramics is carried out in the following steps:

[0014] 1. Put the nitrate in a drying oven to dry separately to obtain a nitrate reactant;

[0015] 2. Drying the Al powder in a vacuum oven to obtain the Al powder reactant;

[0016] 3. The diluent is dried in a vacuum drying oven to obtain the diluent; wherein the diluent is made of Al 2 o 3 and MgO, and the Al in the system after the reaction 2 o 3 The molar ratio of MgO and MgO is 1:1;

[0017]Four, the nitrate reactant obtained in step one, the Al powder reactant obtained in step two and the diluent obtained in step three are mixed by ball milling, then packed into the reaction device, ignited raw materials, and carried out combustion exothermic reaction, reaction time 2 o 4 Ceramics; wherein the mol ratio of the nitrate reactant obtained in step 1 described in step 4 and the Al pow...

specific Embodiment approach 2

[0023] Specific embodiment two: this embodiment is different from specific embodiment one: the nitrate reactant described in step one is Mg(NO 3 ) 2 and Al(NO 3 ) 3 one or a mixture of the two. Other steps and parameters are the same as those in Embodiment 1.

[0024] When the nitrate reactant in the present embodiment is a mixture, both are mixed in an arbitrary ratio.

specific Embodiment approach 3

[0025] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the drying treatment in step 1 is achieved by drying at a temperature of 50-70° C. for 8 hours to 12 hours. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a method for synthetizing a fused cast by combustion of MgAl2O4 ceramic, relates to a method for synthetizing the fused cast by combustion of the MgAl2O4 ceramic, and aims at solving the technical problems of high cost, complicated process and environmental pollution of the traditional MgAl2O4 ceramic. Reactants in the method disclosed by the invention are Al and nitrate; diluents are Al2O3 and MgO; the materials are ignited to react through combustion and heat release of the Al and the nitrate; the experimental process is fast; the reaction time is less than 10 minutes. Thus, the method is short in preparation cycle, low in cost, high in purity of obtained product, simple in experimental process, and easy to control and operate. The temperature and the pressure of a system can be controlled by controlling the content of the diluents; each ingredient is controlled to meet the required ratio when the safety of the experiment is ensured; an external heat source is not needed; the system is heated by the heat release of reaction. Thus, the cost is low; no toxic gas is generated; the method can be applied to the field of preparation of the MgAl2O4 ceramic.

Description

technical field [0001] The present invention relates to a kind of MgAl 2 o 4 Combustion synthesis melting casting method of ceramics. Background technique [0002] MgAl 2 o 4 As a refractory oxide with high melting point (Tm=2100℃), in MgO-Al 2 o 3 In the binary system, it is the only compound that can exist stably, and it has excellent mechanical properties, excellent chemical corrosion resistance, good thermal shock resistance (compared with its composition phase periclase and corundum), high softening temperature under load, and high resistance to chemical corrosion. Slag has good performance and good creep resistance, so it has a wide range of applications in the fields of high-temperature structural ceramics, refractory materials, electronics industry and optical equipment. [0003] MgAl 2 o 4 Ceramics can be obtained through steps such as powder making and sintering. In recent years, researchers have developed a variety of methods to prepare MgAl 2 o 4 Nano p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/443C04B35/64
Inventor 郑永挺杨攀赫晓东
Owner HARBIN INST OF TECH
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