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

A technology of thermal insulation materials and thermal processing, which is applied in the field of thermal insulation materials and its preparation, can solve problems such as weak bonding, insufficient thermal insulation performance of basalt fiber cloth, easy cracking and falling off, etc., so as to improve simplicity and flexibility, and solve all problems. The problem of process insulation and the effect of strengthening the insulation effect

Inactive Publication Date: 2007-11-14
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 f

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Example 1 The reduction of the cooling rate of the surface of the hot forging by the high-viscosity thermal insulation material of the present invention

[0066] A comparison experiment of hot forging was carried out on a 5 ton electro-hydraulic hammer using a GH4742 superalloy billet weighing 20 kg. Two billets with the same size and weight, one of which is made of high-viscosity heat-insulating material, and the other is not taken with heat-insulation measures. The forging experiment is carried out on a forging hammer. The initial heating temperature is 1140°C. During the forging process, the surface temperature of the billet changes with time. Condition. Figure 1 shows the effect of high-viscosity thermal insulation material on the cooling rate of the surface of hot forgings. It can be seen from Figure 1 that the temperature drop rate of the billet is significantly slowed down after the use of viscous thermal insulation material. If the final forging temperature of...

Embodiment 2

[0068] Example 2 The improvement of the cooling speed of the hot forging surface by the multi-layer composite thermal insulation material

[0069] The multi-layer composite thermal insulation material has good heat insulation performance, and can reduce the contact heat transfer heat flux between the blank and the mold from 200kW·m under direct contact conditions. -2 Reduced to 40kW·m when using insulation materials -2 the following. Hot die forging is performed on a hydraulic press, and its characteristic strain rate is usually on the order of 0.01s -1 to 0.1s -1, the total time for die forging of disc-shaped forgings is generally less than 100s. If the mold preheating temperature is 600°C, within the above forging time range, the surface temperature of the billet will drop by about 10% of the original temperature of the billet. For example, as shown in Figure 3 For the multi-layer insulation material shown, when the initial temperature of the billet is 1150°C, the surfa...

Embodiment 3

[0071] Example 3 The use effect of the thermal insulation material of the present invention under different thermal processing conditions

[0072] In this embodiment, a large-size GH4698 alloy turbine disk forging with a diameter of 1200 mm for a gas turbine is die-forged on a 1MJ counter-hammer, and the total load required for forging the forging has reached the limit of the equipment capacity. Under the condition that no heat preservation measures are used on the forging hammer, the surface temperature of the blank should be kept higher than 950°C, the allowed forging time should not exceed 150s, and the number of hammering hammers should not exceed 40 hammers. Numerical simulation calculations and experiments have shown that under the above conditions Under this condition, the forging cannot be completed, the forging cannot fill the cavity, and the diameter cannot reach the specified size. Die forgings of predetermined size can only be obtained by greatly extending the fo...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C03C3/091C03C13/00B21J1/00
CPCC03C3/091
Inventor 张北江段素杰秦鹤勇胥国华赵光普罗洪春
Owner CENT IRON & STEEL RES INST
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