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Lift tube for low-voltage cast aluminum and preparation thereof

A riser tube and low-pressure casting technology, which is applied in the field of riser tubes for low-pressure aluminum casting and its preparation, can solve the problems of high price, high cost, and poor corrosion resistance, and achieve easy operation and control, good performance, The effect of a uniform structure

Inactive Publication Date: 2011-02-02
ZIBO GUIYUAN TAISHENG ADVANCED CERAMIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing riser pipes on the market have various problems that limit their application. The metal material has the problem of sticking aluminum liquid, and the metal and ceramic composite structure is not favored by the market because of its cumbersome manufacturing process and high cost. Most of them are made of aluminum titanate and silicon nitride combined with silicon carbide, which has good performance and has become an alternative material for the above two risers
The price of aluminum titanate is low, but its corrosion resistance is not as good as that of silicon nitride combined with silicon carbide. At present, the manufacturing process of silicon nitride combined with silicon carbide material riser mostly adopts grouting or isostatic pressing. The internal structure is uneven, and it is easy to have defects such as delamination during nitriding firing, which affects product quality. Moreover, the cost of isostatic pressing is high and expensive, and it is difficult to popularize and apply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh the following raw materials by weight percentage: 16% of metal silicon powder, 1% of silicon nitride powder, 5% of sintered mullite, add 6% of acrylamide monomer and 2% of N, N'-methylene Bisacrylamide was wet-milled and mixed for 1 hour as a cross-linking agent. After grinding, 78% silicon carbide particle-grade ingredients were added, stirred evenly and vacuum degassed, and an aqueous ammonium persulfate solution with a weight concentration of 15% was added as an initiator. The good slurry is injected into the mold cavity that is kept in vibration state, the vibration frequency is 2000 times / min, and the amplitude is 1.5mm. After curing, the mold is demolded in 30 minutes, dried until the moisture content is <0.5%, and fired in a furnace.

[0035] The firing system control of nitriding firing is:

[0036] (1) Room temperature -600°C, heating time 18 hours, after 5 hours of heat preservation, vacuumize the furnace to a vacuum degree of -0.1MPa, and then fill the ...

Embodiment 2

[0046] Weigh the following raw materials by weight percentage: metal silicon powder 18%, silicon nitride powder 4%, sintered mullite 10%, add 4% acrylamide monomer and 1% N, N'-methylene Bisacrylamide was wet milled and mixed for 1.5 hours as a cross-linking agent. After grinding, 68% silicon carbide particle-grade ingredients were added, stirred evenly and vacuum degassed, and an aqueous solution of ammonium persulfate with a weight concentration of 18% was added as an initiator. The good slurry is injected into the mold cavity that is kept in a vibrating state, the vibration frequency is 2050 times / min, and the amplitude is 1.8mm. After curing, it is demoulded in 40 minutes, dried until the moisture content is <0.5%, and fired in a furnace.

[0047] The firing system control of nitriding firing is:

[0048] (1) Room temperature -600°C, heating time 16 hours, after 6 hours of heat preservation, vacuumize the furnace to a vacuum degree of -0.1MPa, and then fill the furnace wit...

Embodiment 3

[0058] Weigh the following raw materials by weight percentage: metal silicon powder 18%, silicon nitride powder 2%, sintered mullite 8%, add 3% acrylamide monomer and 0.8% N, N'-methylene Bisacrylamide was wet milled and mixed for 2 hours as a cross-linking agent. After grinding, 72% silicon carbide particle-grade ingredients were added, stirred evenly and vacuum degassed, and an aqueous ammonium persulfate solution with a weight concentration of 16% was added as an initiator. The good slurry is injected into the mold cavity that is kept in a vibrating state, the vibration frequency is 2100 times / min, and the amplitude is 1.6mm. After 35 minutes of curing, the mold is demoulded, dried until the moisture content is less than 0.5%, and fired in a furnace.

[0059] The firing system control of nitriding firing is:

[0060] (1) Room temperature -600°C, heating time 19 hours, after holding for 4 hours, vacuumize the furnace to a vacuum degree of -0.1MPa, and then fill the furnace w...

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PUM

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Abstract

The invention relates to a liquid lift tube for low-pressure cast aluminum and a preparation method thereof, belonging to the technical field of special ceramics. The components in percentage by weight of a liquid lift tube body are: 15 to 20 percent of 350 mesh sieve metallic silicon powder, 1 to 5 percent of 325 mesh sieve silicon nitride powder, 5 to 10 percent of 325 mesh sieve sintered mullite powder and 68 to 78 percent of silicon carbide granular material. In the components of the liquid lift tube for the low-pressure cast aluminum, the sintered mullite is especially selected as an additive so as to allow the liquid lift tube to have good service performance, and a vibration gel-casting technique is adopted so as to ensure that blank bodies are uniform in internal structure and good in quality; moreover, the preparation method has the advantages of low equipment investment, simple production process, easy operation and control and convenient implementation.

Description

technical field [0001] The invention relates to a liquid riser for low-pressure cast aluminum and a preparation method thereof, belonging to the technical field of special ceramics. Background technique [0002] The riser pipe is one of the key components on the low-pressure aluminum casting machine, and its performance directly affects the quality and production efficiency of cast aluminum products. The working conditions of the riser pipe require that it should have good thermal shock resistance, corrosion resistance to high-temperature aluminum liquid, no infiltration with aluminum liquid, good air tightness and thermal shock fatigue resistance. The existing riser pipes on the market have various problems that limit their application. The metal material has the problem of sticking aluminum liquid, and the metal and ceramic composite structure is not favored by the market because of its cumbersome manufacturing process and high cost. Most of them are made of aluminum tita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/567
Inventor 高礼文樊震坤许业静刘天程范勇刘宝英刘德军
Owner ZIBO GUIYUAN TAISHENG ADVANCED CERAMIC