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Preparation method of a special composite structure riser for low pressure casting

A composite structure and low-pressure casting technology, which is applied in the direction of pipes, rigid pipes, mechanical equipment, etc., to achieve the effects of good thermal shock resistance, saving production costs, and high hardness

Inactive Publication Date: 2011-12-28
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the single-structure cast iron riser and silicon nitride combined silicon carbide riser, to provide a high temperature resistance and good thermal shock resistance, air tightness and non-polluting aluminum liquid Preparation method of special composite structure riser

Method used

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  • Preparation method of a special composite structure riser for low pressure casting
  • Preparation method of a special composite structure riser for low pressure casting
  • Preparation method of a special composite structure riser for low pressure casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Such as figure 1 The technological process shown, the production process is as follows:

[0047] (1) The preparation of silicon nitride-bonded silicon carbide inner and outer tubes includes the following continuous steps:

[0048] A. According to silicon carbide: silicon = 70:30, weighing 2 ~ 1mm accounted for 40%, 1 ~ 0.088mm accounted for 20%, less than 0.088mm accounted for 10% of various silicon carbide raw materials and 30% silicon powder in the mixer Mix for 5-6 minutes, then add liquid resin accounting for 3% of the total amount of the above raw materials as a binder, and mix for another 15-20 minutes. The batch material is dried at 60°C and then sieved, and the material between 0.1 and 2.5 mm is retained to form the granulated material.

[0049] B. The above-mentioned granulated batch is subjected to cold isostatic pressing under a pressure of 140 MPa.

[0050] C. Dry the pressed tube blank at 200°C for 24 hours.

[0051] D. The dried tube blank is processed...

Embodiment 2

[0056] Such as figure 1 The technological process shown, the production process is as follows:

[0057] (1) The preparation of silicon nitride-bonded silicon carbide inner and outer tubes includes the following continuous steps:

[0058] A. According to silicon carbide: silicon = 75:25, weighing 2 ~ 1mm accounted for 45%, 1 ~ 0.088mm accounted for 15%, less than 0.088mm accounted for 15% of various silicon carbide raw materials and 25% silicon powder in the mixer Mix for 5-6 minutes, then add liquid resin accounting for 4% of the total amount of the above raw materials as a binder, and mix for another 15-20 minutes. The batch material is dried at 50°C and then sieved, and the material between 0.1 and 2.5mm is retained to form the granulated material.

[0059] B. The above granulated batch is subjected to cold isostatic pressing under a pressure of 150 MPa.

[0060] C. Dry the pressed tube blank at 150°C for 24 hours.

[0061] D. The dried tube blank is processed into the r...

Embodiment 3

[0066] Such as figure 1 The technological process shown, the production process is as follows:

[0067] (1) The preparation of silicon nitride-bonded silicon carbide inner and outer tubes includes the following continuous steps:

[0068] A. According to silicon carbide: silicon = 80:20, weighing 2 ~ 1mm accounted for 40%, 1 ~ 0.088mm accounted for 15%, less than 0.088mm accounted for 25% of various silicon carbide raw materials and 20% silicon powder in the mixer Mix for 5-6 minutes, then add liquid resin accounting for 3% of the total amount of the above raw materials as a binder, and mix for another 15-20 minutes. The batch material is dried at 60°C and then sieved, and the material between 0.1 and 2.5 mm is retained to form the granulated material.

[0069] B. The above-mentioned granulated batch is subjected to cold isostatic pressing under a pressure of 140 MPa.

[0070] C. Dry the pressed tube blank at 180°C for 24 hours.

[0071] D. The dried tube blank is processed...

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Abstract

The invention belongs to the technical field of thermal equipment manufacturing of refractory materials, and relates to a method for preparing a riser with a special composite structure for low-pressure casting. It uses Si3N4 combined with SiC material as the inner and outer pipes of the riser, the interlayer material is cast iron pipe or seamless steel pipe, and the three layers are bonded into a whole with high-temperature adhesive. Si3N4 bonded SiC inner and outer tubes are prepared by using silicon carbide and metal silicon as the main raw materials, adding organic binders, and going through the processes of mixing, granulating, cold isostatic pressing, drying, blank processing, high-temperature nitriding and firing; As interlayer materials, cast iron pipes or steel pipes with high temperature resistance (800°C), good air tightness and thermal shock resistance are used. The high-temperature binder can be one of silicon carbide cement, aluminate cement, alumina cement, etc. kind. The riser made by the invention has the advantages of high high temperature strength, good thermal shock resistance and air tightness, and no wetness and no reaction with molten aluminum. The service life of the riser tube.

Description

technical field [0001] The invention belongs to the field of material preparation, and mainly relates to a method for preparing a riser with a special composite structure for low-pressure casting. Background technique [0002] The riser tube is one of the key components on the aluminum alloy low-pressure casting machine such as the cylinder and wheel hub of automobiles and motorcycles. When working, the lower end is placed in the holding furnace of the low-pressure casting machine for sealing aluminum melt (temperature 700-900°C), and the upper end is connected to the low-pressure casting mold cavity, and the molten aluminum rises into the mold cavity through the pressure action along the riser pipe to complete the cycle. Permanent casting to achieve automation and continuity. As a pipeline for conveying high-temperature aluminum alloy liquid, the material is required not only to be resistant to high temperature (800°C), resistant to erosion and corrosion of aluminum liquid...

Claims

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Application Information

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IPC IPC(8): F16L9/02C04B37/02C04B35/66
Inventor 刘春侠王文武黄志刚张治平闻彪龚剑锋赵俊国张扬
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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