Super high temperature molybdenum disilicide zirconia composite heating element and its preparation method

A molybdenum disilicide and zirconia technology, which is applied in the field of ultra-high temperature molybdenum disilicide and zirconia composite heating element and its preparation, can solve the problems of poor creep resistance, small application range, weak creep resistance, etc. Excellent thermal properties and high temperature creep resistance, overcoming the effects of low low temperature resistance and poor thermal vibration resistance

Inactive Publication Date: 2006-11-22
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zirconia fast ion conductor is also a high-temperature heating element used in an oxidizing atmosphere. The operating temperature can reach above 2000 degrees. However, it has the disadvantage of being non-conductive at low temperatures. A lot of inconvenience has come, so the scope of application is small
With the advancement of science and technology, higher requirements have been placed on the operating temperature of the heating element. Kanthal Fuenace Products of Sweden developed a new product of Kanthal super 1900 in the early 1990s, but due to its internal Contains more glass phases that cause high-temperature deformation, so there are still disadvantages of high-temperature deformation and short life
Riken Corporation of Japan published in 1997 a method of using organic bonding to manufacture a heating element that can be used above 1800°C (Japanese Patent Laid-Open No. 10-297972), but the resistivity of the heating element is too small, so that the heating The cost of the power supply and control system of the furnace is increased, and the single-phase molybdenum disilicide material has low high-temperature strength, weak creep resistance, and a short service life of the heating element
The publication number of the patent "Molybdenum Disilicide-based Composite Heating Element and Preparation Method" is 1314448, which uses plastic inorganic aluminosilicate as the binder for forming the heating element. Although the Na removal treatment can improve the resistance to a certain extent However, due to the low high-temperature strength of the molybdenum disilicide matrix, poor creep resistance, high aluminosilicate content, and low melting point, the heat resistance and high-temperature strength of the molybdenum disilicide heating element are very low. When used at a high temperature of ℃, the heat resistance of the material is limited, and the de-Na treatment process increases the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment and comparative example 1

[0026] Specimen type

[0027]After sintering the materials with different content of zirconia, the strength and heat resistance comparison tests of the rods were carried out. The sintering temperature was kept at 1700 degrees for 2 hours. The results showed that: compared with the single-phase materials B1 and B4, the composite material was sintered to obtain a heating body rod with uniform microstructure, fine grains, and high strength of the rod, while the single-phase material had many pores and grains. Bulky and low strength. From the heat resistance test results, it can be seen that the heat resistance of the material is improved with the addition of zirconia, especially when the zirconia is continuous, the heat resistance of the composite material is significantly improved from 1750 degrees of single-phase molybdenum disilicide B1 1900 degrees to S1. Similarly, the introduction of zirconia also affects the electrical properties of the material at room temperat...

Embodiment and comparative example 2

[0029] Specimen type

[0030] Creep resistance tests were carried out on the rods sintered with different zirconia contents. The test conditions are test temperature / 1000°C, load stress / 100MPa. Table 3 shows the strain values ​​of the five samples after 10 hours and 20 hours after the start of the experiment. It can be seen that the content of zirconia and its microstructural characteristics directly affect the creep degree of the sample. Ten hours after the start of the experiment, the strain of S1 was 0.000031, B1 was 0.0026, B2 was 0.0020, B3 was 0.00010, and B4 was 0.000009. It can be seen that the addition of zirconia can improve the high temperature creep resistance of molybdenum disilicide, especially the added phase When the structure is continuous, the creep resistance is nearly 2 orders of magnitude higher than that of the single-phase molybdenum disilicide material; moreover, the deformation difference between the two will become larger and larger as time...

Embodiment and comparative example 3

[0032] Specimen type

[0033] For the heating element, the thermal shock resistance of the heating element material is evaluated by the current shock resistance performance. The test plan is to heat the heating element to 1500 degrees under the action of alternating current, power on for 30 seconds and then power off for 10 seconds, and so on until the material is destroyed. , the number of cycles to characterize the thermal shock resistance of the heating element. Table 4 shows the thermal shock resistance test results of heating elements with different zirconia content. It can be seen that with the addition of zirconia, the thermal shock resistance of the heating element is affected, especially when the amount of zirconia added is too much, it is When molybdenum disilicide is discontinuous, such as B4, the thermal shock resistance of the material becomes very poor, and the actual application life will be very short.

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PUM

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Abstract

This invention relates to a hyperthermal molybdenum disilicon zirconium oxide compound heater, belonging to the heating material technology. This heater uses molybdenum disilicon zirconium oxide two-phage reticulated structure compound material as matrix, concretely it uses (Mo1-x,Wx)Si2 as one phage of the two-phage compound material, where X=0-0.5, and uses yttrium oxide/calcium oxide stabilized zirconium oxide powder as the other phage, where the content of the zirconium oxide powder is 30-70vol% of the compound material. The process comprises: charging the above two-phage compound material and sintering aid, adding in adhesive for pugging, extrusion molding, drying, burning and filming treatment, so as to obtain the product, wherein: the bar produced by organic adhesive molding and drying needs degreasing process under 0.1MPa hydrogen gas pressure, at 300-600Deg C for 3-30 hours, where the burning temperature is 1500-1750Deg C. The invention can produce high efficient and long-life heater at more than 1850Deg C.

Description

Technical field [0001] The invention belongs to the heating material technology, and mainly proposes an ultra-high temperature molybdenum disilicide zirconia composite heating element and a preparation method thereof. Background technique [0002] Molybdenum disilicide material has good high temperature oxidation resistance because it can form a dense protective film on the surface at a high temperature above 1000 ° C. It has been widely used as a high temperature heating element used in an atmospheric environment. Its own The highest heat-resistant temperature can reach above 1800°C. Zirconia fast ion conductor is also a high-temperature heating element used in an oxidizing atmosphere. The operating temperature can reach above 2000 degrees. However, it has the disadvantage of being non-conductive at low temperatures. A lot of inconvenience has come, so the scope of application is small. With the advancement of science and technology, higher requirements have been placed o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/488C04B35/58C04B35/622C04B35/632
Inventor 王刚周军
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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