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Ceramic sprue gate bushing for low pressure casting of aluminum alloy and manufacturing method thereof

A technology of low-pressure casting and manufacturing method, applied in the field of low-pressure casting of aluminum alloys, can solve the problems of brittleness of bushing, pollution of aluminum liquid, reverse cooling, etc., and achieve the effects of reducing thermal expansion coefficient, improving casting quality, and long service life

Active Publication Date: 2014-09-03
江苏高鑫高温新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the steel bushing has the following defects: (1) The steel conducts heat quickly, and it is prone to pouring during the pouring process, that is, the casting is not solidified, and the gate solidifies first, so feeding cannot be realized, resulting in casting defects such as shrinkage cavities and porosity; (2) Steel is easy to infiltrate into molten aluminum. On the one hand, the molten aluminum is polluted, resulting in changes in the composition and performance of the casting. On the other hand, solidified aluminum material is likely to remain at the bushing corroded by the molten aluminum, making it difficult to take out the parts.
Although when the aluminum titanate sintered body is heated, most of the thermal expansion is offset by the bridging of numerous fine cracks, resulting in good thermal shock resistance, but the existence of cracks makes it difficult for the aluminum titanate material to be densely sintered, resulting in mechanical strength. Low, the bending strength is about 20MPa, so when the casting is picked up, the aluminum titanate sprue bushing is easily broken by collision, so the life of the pure aluminum titanate bushing is relatively low

Method used

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  • Ceramic sprue gate bushing for low pressure casting of aluminum alloy and manufacturing method thereof
  • Ceramic sprue gate bushing for low pressure casting of aluminum alloy and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) First mix the α-alumina raw material powder with a particle size (D98) of 2.5 μm and the titanium dioxide raw material powder with an anatase or rutile particle size (D98) of 0.5 μm at a weight ratio of 1.1:1, and add 2% SiO by weight 2 , 2% MgO and 2% CeO 2 Three stabilizers, mixed thoroughly;

[0022] (2) The powder obtained in step (1) was roasted at 1380°C for 2.5 hours, ground to a size below 5 μm, and sieved to obtain aluminum titanate powder;

[0023] (3) adding the aluminum titanate powder obtained in step (2) to the alumina raw material powder according to 6% by weight and fully mixing to obtain a mixed powder;

[0024] (4) Add PVA glue and water to the mixed powder obtained in step (3), mix and granulate, press and shape, and pre-sinter at 1100°C for 2 hours to obtain a pre-sintered body;

[0025] (5) Prepare the aluminum titanate powder obtained in step (2), PVA glue and pure water to make a slurry, the weight fractions are: the content of aluminum tit...

Embodiment 2

[0029] (1) First mix the α-alumina raw material powder with a particle size (D98) of 2.5 μm and the titanium dioxide raw material powder with an anatase particle size (D98) of 0.5 μm at a weight ratio of 1.1:1, and add a weight fraction of 2.5% SiO2 2 , 2.5% MgO and 2.5% Fe 2 o 3 Three stabilizers, mixed thoroughly;

[0030] (2) The powder obtained in step (1) was roasted at 1380°C for 2.5 hours, ground to a size below 5 μm, and sieved to obtain aluminum titanate powder;

[0031] (3) adding the aluminum titanate powder obtained in step (2) to the alumina raw material powder according to 8% by weight and fully mixing to obtain a mixed powder;

[0032] (4) Add PVA glue and water to the mixed powder obtained in step (3), mix and granulate, press and shape, and pre-sinter at 1100°C for 2 hours to obtain a pre-sintered body;

[0033] (5) Prepare the aluminum titanate powder obtained in step (2), PVA glue and pure water into a slurry, the weight fractions are: the content of alu...

Embodiment 3

[0037] (1) First mix the α-alumina raw material powder with a particle size (D98) of 2.5 μm and the titanium dioxide raw material powder with an anatase particle size (D98) of 0.5 μm at a weight ratio of 1.1:1, and add a weight fraction of 3% SiO 2 , 3% MgO and 3% Fe 2 o 3 Three stabilizers, mixed thoroughly;

[0038] (2) The powder obtained in step (1) was roasted at 1380°C for 2.5 hours, ground to a size below 5 μm, and sieved to obtain aluminum titanate powder;

[0039] (3) adding the aluminum titanate powder obtained in step (2) to the alumina raw material powder according to 11% by weight and fully mixing to obtain a mixed powder;

[0040] (4) Add PVA glue and water to the mixed powder obtained in step (3), mix and granulate, press and shape, and pre-sinter at 1100°C for 2 hours to obtain a pre-sintered body;

[0041] (5) Prepare the aluminum titanate powder obtained in step (2), PVA glue and pure water to make a slurry, the weight fractions are: the content of alumin...

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Abstract

The invention discloses a ceramic sprue gate bushing for low pressure casting of aluminum alloy and a manufacturing method of the ceramic sprue gate bushing for low pressure casting of aluminum alloy. The bushing is tubular and comprises a bushing body and a coating layer, wherein the bushing body is made of composite ceramic materials of aluminum oxide and aluminum titanate, and the coating layer is an aluminum titanate ceramic coating layer. The manufacturing method includes the steps that first, aluminum oxide raw material powder, titanium dioxide raw material powder and stabilizing agents are fully mixed to prepare base powder; second, the base powder is roasted at the temperature ranging from 1350 DEG C to 1400 DEG C so that aluminum titanate powder can be obtained; third, the aluminum titanate powder is added into aluminum oxide raw material powder according to the weight fraction ranging from 6 percent to 13 percent to be fully mixed so that mixed powder can be obtained; fourth, after the mixed powder is palletized, compression molding is performed, and pre-sintering is performed; the aluminum titanate powder, PVA glue and water are mixed to form a sizing agent; sixth, the pre-sintered body is placed in the sizing agent, and soaked in the sizing agent and lifted out of the sizing agent several times, and then the pre-sintered body is dried; seventh, a sprue gate bushing containing the aluminum titanate coating layer is placed in a furnace and sintered at the temperature ranging from 1450 DEG C to 1650 DEG C and then the final product can be obtained.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy low-pressure casting, in particular to a sprue bushing made of ceramic material for aluminum alloy low-pressure casting and a manufacturing method thereof. Background technique [0002] Compared with the traditional gravity casting technology, low-pressure casting has many advantages. At present, in the field of casting of automotive parts, such as cylinder head, cylinder block, brake drum, clutch cover, wheel hub, intake manifold, etc., especially in the casting of automotive wheels In casting, low-pressure casting technology has been widely used. [0003] For the low-pressure casting of aluminum alloy parts for automobiles, the sprue bushing is one of the key components of the gating system. The service environment requires it to have performance characteristics such as thermal shock resistance, aluminum liquid corrosion resistance, and low thermal conductivity. Steel bushings are common...

Claims

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Application Information

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IPC IPC(8): B22D18/04C04B35/66
Inventor 宋振亚钱晓飞高桂航
Owner 江苏高鑫高温新材料科技有限公司
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