Heat-resisting cast iron casting coating and preparation method thereof

A technology for casting coatings and heat-resistant cast iron, applied in casting molding equipment, coatings, casting molds, etc., can solve problems such as thixotropy and insufficient high-temperature strength, achieve good heat insulation, improve high-low temperature strength, and good thixotropy Effect

Inactive Publication Date: 2014-11-26
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the above-mentioned coatings is that the thixotropy and high-temperature strength are not enough

Method used

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  • Heat-resisting cast iron casting coating and preparation method thereof
  • Heat-resisting cast iron casting coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for preparing a lost foam casting coating for heat-resistant cast iron, the method comprising the following steps:

[0034] 1) Preparation of nanoscale (Mg, Fe)2(SiO4) composite powder:

[0035] Dissolve 20g of aluminum hydroxide Al(OH)3 in 200mL of 10mol / L potassium hydroxide aqueous solution; then put it in a container and heat it to 120°C, keep it warm for 26 hours, filter out the precipitate with filter paper, and wash it with deionized water Clean 5 times; then heat the washed precipitate to 400°C in a high-temperature furnace for 1 hour to obtain product A for use;

[0036] Mix 117g FeCl3 6H2O with 43g FeCl2 4H2O, dissolve 250g of Dextran T-40 in 1500ml of pure water under a nitrogen-filled environment, then add the mixture of FeCl3 6H2O and FeCl2 4H2O; stir with a constant temperature magnetic stirrer, stirring speed 1200r / min, at the same time, dropwise add 1200ml of ammonia water with a mass percentage concentration of 30%, raise the temperature to 80...

Embodiment 2

[0044] Product A, colloid B and (Mg, Fe) in step 1) 2 (SiO 4 ) The mass ratio of the three powders mixed is 0.5:1:0.6;

[0045] Step 3) Preparation of heat-resistant cast iron casting coating: the weight percentage of each component is: nano-scale (Mg, Fe)2(SiO4) composite powder 28%, fly ash 4%, sodium laurylalanine 0.8 %, sodium bentonite 10%, 3-methyl-2-buten-1-ol acetate composite solution 33%, silicon carbide powder and the rest.

[0046] All the other preparation processes are the same as in Example 1.

Embodiment 3

[0048] Product A, colloid B and (Mg, Fe) in step 1) 2 (SiO 4 ) The mass ratio of the three powders mixed is 0.5:1:0.5;

[0049] Step 3) Preparation of heat-resistant cast iron casting coating: wherein the weight percentage of each component is:

[0050] The weight percent of each component in this material is: nanoscale (Mg, Fe) 2 (SiO4) composite powder 27%, fly ash 3%, sodium dodecylalanine 0.5%, sodium bentonite 9.5%, 32% of 3-methyl-2-buten-1-ol acetate composite solution, silicon carbide powder and the rest.

[0051] All the other preparation processes are the same as in Example 1.

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Abstract

The invention provides a heat-resisting cast iron casting coating and a preparation method thereof. The heat resisting cast iron casting coating comprises the following components in percentage by weight: 25 to 28 percent of nano-scale (Mg, Fe)2(SiO4) composite powder, 2 to 4 percent of fly ash, 0.4 to 0.8 percent of dodecyl amino sodium propionate, 9 to 10 percent of sodium bentonite, 31 to 33 percent of 3-methyl-2-butene-1-acetate composite solution, and the balance of silicon carbide powder, wherein the fly ash comprises the following components in percentage by weight: 3 to 4 percent of CaO, 26 to 28 percent of Al2O3, 1 to 2 percent of MgO, 5 to 7 percent of Fe2O3, and the balance of SiO2; the silicon carbide powder comprises the following components in percentage by weight: 99.8 percent of SiC and the balance of SiO2; the particle size of the silicon carbide powder is 0.5 to 1 mm; and the particle size of the bentonite and the fly ash is 80 to 100 microns.

Description

technical field [0001] The invention belongs to the field of coatings, and relates to a heat-resistant cast iron casting coating and a preparation method thereof. Background technique [0002] Application No. 201010105706.6 discloses an EPC cast iron coating for preventing carbon defects, which consists of the following components by mass percentage: 60.5% to 64.5% of bauxite, 13.5% to 17.5% of kaolin, and 3.5% to 6.0% of talc powder, 1.7%-3.5% attapulgite clay, 0.4%-0.8% sodium lignosulfonate, 2.5%-6.0% aluminum sulfate, 1.7%-3.5% polyvinyl alcohol, 3.5%-5.0% Silica sol, 0.1%-0.2% iron oxide powder, 0.01%-0.02% n-octanol, the total amount of the above components is 100%. Prepare attapulgite stick clay, polyvinyl alcohol, aluminum sulfate aqueous solution, bauxite, kaolin, talcum powder and iron oxide powder are uniformly mixed into a refractory powder mixture, and attapulgite stick clay, polyvinyl alcohol, aluminum sulfate aqueous solution , Silica sol, refractory powder ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00
Inventor 王玲赵浩峰陈晓玲邱奕婷陆阳平郑泽昌柯维雄赵佳玉王冰胡庚祥侯少杰王明一张林
Owner NANJING UNIV OF INFORMATION SCI & TECH
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