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A kind of water-soluble ceramic core material and the method for preparing water-soluble ceramic core

A technology of ceramic cores and ceramic materials, applied in the field of precision casting, can solve the problems of unsearched gas generation level, mechanical strength, heat resistance, low strength, poor surface finish, etc.

Active Publication Date: 2018-03-09
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in terms of the reports in the current literature and the actual application situation (Jiangsu University. A water-soluble ceramic core and its preparation method, CN201210276204.9, 2012-11-21. The wet compression resistance of the core obtained by this patent The strength is 0.025MPa, the dry compressive strength is about 1.2MPa, and the strength is low), this type of core still has problems such as poor surface finish and low strength, and it is difficult to promote it in actual production
Public literature on water-soluble ceramic core materials that take into account the surface quality, gas generation level, mechanical strength, heat resistance, and water solubility of the core has not been retrieved

Method used

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Examples

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Effect test

preparation example Construction

[0026] The preparation method of the water-soluble ceramic core as described above is characterized in that: the steps of preparation are as follows:

[0027] 1. Raw material pretreatment:

[0028] 1.1. Put the high-temperature-resistant ceramic material into the muffle furnace and heat it to 800°C-1000°C, and keep it warm for 2h-5h;

[0029] 1.2. Ball mill the water-soluble inorganic salt at a speed of 300r / min-600r / min for 1h-5h, and select the powder that passes through a 120-mesh sieve;

[0030] 1.3. Grind the water-soluble metal oxide in a mortar, select the powder that has passed through a 120-mesh sieve, put it in a muffle furnace and heat it to 800°C-1000°C, and keep it warm for 1h-5h;

[0031] 1.4. Put the amorphous ceramic material into the muffle furnace and heat it to 500℃~800℃, and keep it warm for 2h~5h;

[0032] 2. Raw material weighing: Weigh the pretreated high-temperature-resistant ceramic materials, water-soluble inorganic salts, water-soluble metal oxides...

Embodiment 1

[0050] A water-soluble ceramic core material, which is composed of alumina powder with a particle size of 2000 mesh, sodium chloride, calcium oxide and amorphous silica powder with a particle size of 500 mesh; wherein the mass fraction of alumina powder is 57%, The mass fraction of sodium chloride is 30%, the mass fraction of calcium oxide is 5%, and the mass fraction of amorphous silicon dioxide is 8%.

[0051] The method for preparing a material water-soluble ceramic core by the above-mentioned water-soluble ceramic core material, the steps of its preparation are as follows:

[0052] 1. Raw material pretreatment:

[0053] 1.1. Put the alumina powder into the muffle furnace and heat it to 850°C, and keep it warm for 3 hours;

[0054] 1.2. Ball mill sodium chloride for 1 hour at a speed of 500r / min, and select the powder that passes through a 120-mesh sieve;

[0055] 1.3. Put the calcium oxide into a mortar and grind it, select the powder that has passed through a 120-mesh s...

Embodiment 2

[0070] A water-soluble ceramic core material, which is composed of alumina powder with a particle size of 200 mesh, potassium chloride, calcium oxide and amorphous silica powder with a particle size of 1000 mesh; wherein the mass fraction of alumina powder is 67%, The mass fraction of potassium chloride is 20%, the mass fraction of calcium oxide is 8%, and the mass fraction of amorphous silicon dioxide is 5%.

[0071] The method for preparing a material water-soluble ceramic core by the above-mentioned water-soluble ceramic core material, the steps of its preparation are as follows:

[0072] 1. Raw material pretreatment:

[0073] 1.1. Put the alumina powder into the muffle furnace and heat it to 820°C for 3 hours;

[0074] 1.2. Ball mill potassium chloride for 1 hour at a rotational speed of 500r / min, and select the powder that passes through a 120-mesh sieve;

[0075] 1.3. Put the calcium oxide into a mortar and grind it, select the powder that has passed through a 120-mesh...

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Abstract

The invention belongs to the precision casting technique and relates to a water-soluble ceramic core material and a preparation method thereof. The water-soluble ceramic core material comprises a high-temperature ceramic material, water-soluble inorganic salts, metallic oxides and at least one amorphous ceramic material. The preparation method comprises the following steps: raw material pretreatment, raw material weighing, mixing, mold core forming, degreasing, sintering and secondary sintering. According to the water-soluble ceramic core material and the preparation method, the properties of surface quality, dimensional precision, foaming level, mechanical strength, heat resistance, water solubility, environment friendliness and the like of the mold core can be considered, and scientific research and production requirements of aluminum alloy are met.

Description

technical field [0001] The invention belongs to precision casting technology, and relates to a water-soluble ceramic core material for aluminum alloy castings and a method for preparing the water-soluble ceramic core. Background technique [0002] With the continuous improvement of the performance of aviation equipment, there is an increasing demand for light alloy castings with complex inner cavity structure, high quality and high precision. Aluminum alloys are light in weight and have excellent mechanical properties, so they are widely used in aviation, aerospace, weapons, transportation and other fields. The key to the near-net shape of aluminum alloy castings with complex inner cavity structures is to develop core materials suitable for overall molding without allowance, and the properties of the cores (mechanical properties, thermal stability, chemical stability, surface quality, mold release Ease, etc.) and engineering reliability directly affect the pass rate, castin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/626C04B35/64C04B35/10
CPCC04B35/10C04B35/622C04B35/6261C04B35/62645C04B35/62675C04B2235/6022C04B2235/612C04B2235/6562C04B2235/6567C04B2235/661
Inventor 贺德龙王程成益小苏
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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