Heat-processing temperature-cntrolled heat-insulation material, its preparing method and use

Abstract

This invention relates to a temperature-control heat insulating material of the hot working, is oxide of Al2O3 - SiO2 series. According to weight, the components concentration are: 10 to 14% Al2O3, 45 to 52% SiO2, 12 to 16% CaO, 4 to 8%Ca and Na2O, 15 to 22% B2O3. The physics shape of this material under operating conditions is micron order powder or fiber. In the thermo forming process of high-temperature alloy, titanium alloy and so on, this heat insulating material can coat on surface of metal blank to rigidly control deformation temperature, achieve accuracy control, decrease blank heating times, and prolong forge time of each fire.

Description

technical field [0001] The invention relates to a thermal insulation material and its preparation method and application, which are used for controlling the thermal insulation of the forging temperature during the thermal processing of metal materials in the metallurgical and mechanical industries, especially in situations where the deformation temperature of blanks needs to be strictly controlled, such as superalloys and titanium alloys. Background technique [0002] Superalloys and titanium alloys are widely used in aerospace, national defense, shipbuilding, energy and chemical industries. In modern aeronautical turbojet engines, rocket engines, large gas turbines for ground generating sets and ship power, and chemical equipment, high-temperature load-bearing components with operating temperatures above 600 ° C, and components that need to work in high-temperature oxidizing and corrosive medium environments, It is usually required to be manufactured with nickel-based and i...

AI Technical Summary

Problems solved by technology

The use of conventional asbestos insulation materials can significantly slow down the heat loss of alloy blanks, so it has been widely used in the thermal processing of superalloys and titanium alloys for a long time, but this method has great limitations and cannot fully meet the forging process requirements. The requirements for temperature control accuracy of forgings, especially the outstanding problems in the following aspects:

Another problem of this method is the difficulty in the operation process. In order to brush the glass raw material on the asbestos blanket, the water-based adhesive used will harden after drying, and it will easily crack and fall off, making the handling, curling of the asbestos blanket difficult. And use becomes very difficult. In order to alleviate the above difficulties, it is necessary to avoid continuous brushing when brushing glass materials and water-based adhesives on asbestos materials, that is, the brushing area should form several small areas that are independently divided, so that asbestos materials can be used. To a certain extent, it can withstand bending deformation without the glass material falling off, resulting in the reduction of the contact area between the binder and the blank in actual use, and the bond is not firm. Therefore, this kind of commercialized chemical raw material and asbestos refractory material The jacket can not fully meet the thermal insulation performance requirements of superalloys and titanium alloys in terms of thermal insulation performance and operability.

[0011] The aluminum silicate asbestos fiber blanket itself does not have enough ductility, and cannot effectively insulate the blank during the whole process of filling the die forging blank.

In the die forging process, in some cases, basalt fiber cloth is used to replace the conventional aluminum silicate fiber blanket to wrap the billet to achieve a certain insulation effect. The adverse effect on the filling process of the billet is less than that of the stainless steel aluminum silicate composite sheath, but the thermal insulation performance of the basalt fiber cloth is insufficient. Although it has a certain degree of flexibility, it cannot withstand large deformation. When violently rubbed, it will still break and lose the insulation effect

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