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Lost foam coating and preparation method thereof

A technology of lost foam and coating, which is applied in the direction of coating, manufacturing tools, casting and molding equipment, etc., which can solve the problems of poor coating adhesion and high manufacturing cost, and achieve the effect of strong adhesion, low use cost and good air permeability

Active Publication Date: 2012-12-26
苏州科博尔机床集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Alcohol-based coatings are usually used for existing large-scale castings, and methanol is used as a solvent. Although the quality of the castings is good, there are problems of high manufacturing costs due to poor coating adhesion.

Method used

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  • Lost foam coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The ratio of each component of the lost foam coating is: 45 parts by weight of 200-mesh high-alumina bauxite clinker, 8 parts by weight of 200-mesh corundum powder, 25 parts by weight of 250-mesh quartz powder, 3 parts by weight of flake graphite, 1 part by weight of sodium bentonite, 1.5 parts by weight of CMC, 0.5 parts by weight of polyvinyl alcohol, 1 part by weight of silica sol, 0.3 parts by weight of T-80, 0.4 parts by weight of n-octanol, and 2 parts by weight of iron oxide red powder.

[0020] Follow the steps below to prepare lost foam coatings:

[0021] First, 1 part by weight of sodium bentonite is mixed with 8 parts by weight of water, and stirred at a high speed for 5 hours at a speed above 1000 rpm to form a bentonite slurry; meanwhile, 45 parts by weight of 200-mesh high-alumina bauxite clinker and 8 parts by weight of 200-mesh bauxite clinker are taken. Corundum powder, 25 parts by weight of 250-mesh quartz powder, and 3 parts by weight of flake graphit...

Embodiment 2

[0025] The ratio of each component of the lost foam coating is: 50 parts by weight of 250 mesh high alumina clinker, 10 parts by weight of 230 mesh corundum powder, 20 parts by weight of 250 mesh quartz powder, 5 parts by weight of flake graphite, 2 parts by weight of sodium bentonite, 1 part by weight of CMC, 1 part by weight of polyvinyl alcohol, 2 parts by weight of silica sol, 0.1 part by weight of T-80, 0.3 parts by weight of n-octanol, and 1 part by weight of iron oxide red powder.

[0026] Follow the steps below to prepare lost foam coatings:

[0027] First, mix 2 parts by weight of sodium bentonite with 10 parts by weight of water, and stir at a high speed above 1000 rpm for 6 hours to form a bentonite slurry; meanwhile, take 50 parts by weight of 250-mesh high-alumina bauxite clinker, 10 parts by weight of 230-mesh Corundum powder, 20 parts by weight of 250-mesh quartz powder, and 5 parts by weight of flake graphite were stirred evenly in a grinding device, and 60 par...

Embodiment 3

[0031] The ratio of each component of the lost foam coating is: 55 parts by weight of 300-mesh high-alumina bauxite clinker, 15 parts by weight of 250-mesh corundum powder, 23 parts by weight of 280-mesh quartz powder, 8 parts by weight of flake graphite, 3 parts by weight of sodium bentonite, 0.5 parts by weight of CMC, 1.5 parts by weight of polyvinyl alcohol, 3 parts by weight of silica sol, 0.2 parts by weight of T-80, 0.2 parts by weight of n-octanol, and 3 parts by weight of iron oxide red powder.

[0032] Follow the steps below to prepare lost foam coatings:

[0033] First, 3 parts by weight of sodium bentonite is mixed with 9 parts by weight of water, and stirred at a high speed above 1000 rpm for 7 hours to form a bentonite slurry; meanwhile, 55 parts by weight of 300-mesh high-alumina bauxite clinker, 15 parts by weight of 250-mesh Corundum powder, 23 parts by weight of 280-mesh quartz powder, and 8 parts by weight of flake graphite were stirred evenly in the grindin...

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Abstract

The invention relates to a lost foam coating and a preparation method thereof. The coating comprises the following components in parts by weight: 45-55 parts of bauxite clinker, 8-15 parts of alundum powder, 20-25 parts of quartz powder, 3-8 parts of flaky graphite, 1-3 parts of sodium-based bentonite, 0.5-1.5 parts of CMC (Carboxyl Methyl Cellulose), 0.5-1.5 parts of polyvinyl alcohol, 1-3 parts of silica sol, 0.1-0.3 part of T-80, 0.2-0.4 part of n-caprylic alcohol and 1-3 parts of red ferric oxide powder. The lost foam coating provided by the invention has better high-temperature permeability and good brushability. The lost foam coating has high permeability, extremely strong adhesion and good brushability on the premise of improving the strength of a foam pattern, the foam pattern can meet the handling requirement of a large-sized casting after being dried, and the sand adhesion resistance is high.

Description

technical field [0001] The invention belongs to the field of casting, in particular to the technical field of production of lost foam cast steel. Background technique [0002] Lost foam casting (also known as solid casting) is to bond and combine foam models similar in size and shape to castings to form a model cluster. After brushing refractory paint and drying, it is buried in dry quartz sand for vibration molding, and poured under negative pressure. , the model is vaporized, the liquid metal occupies the position of the model, solidified and cooled to form a new casting method of castings. [0003] Compared with traditional casting technology, lost foam casting has the following characteristics: 1. Good casting quality and low cost; 2. Unlimited material and suitable size; 3. High dimensional accuracy and smooth surface, reducing cleaning workload; 4. Internal Defects are greatly reduced and the organization is compact; 5. Large-scale and mass production can be realized,...

Claims

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Application Information

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IPC IPC(8): B22C3/00B22C9/04
Inventor 陈立国
Owner 苏州科博尔机床集团有限公司
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