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

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...

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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