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Dry-spray powder products for the protection of moulds for the centrifugal casting of iron pipes, in association with a wet-spray powder product

A cast iron pipe, centrifugal casting technology, applied in the direction of casting mold, casting mold composition, casting molding equipment, etc., can solve problems such as unsatisfactory

Inactive Publication Date: 2008-04-09
PECHINEY ELECTROMETALLURGIE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] However, while this type of powder actually ensures that the wet spray coating remains attached to the pipe, it is unsatisfactory with respect to the other above-mentioned effects, including inter alia the inoculation effect and, generally speaking, the gold phase organization effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] As a control test, a dry spray product comprising 100% of a "calcium silicide" alloy comprising 61.1% silicon, 30.4% calcium and 1.21% aluminum was used, the particle size of which was characterized by 25 % of the particles were less than 63 μm in size and 98% of the particles were less than 200 μm in size.

[0056] The product provided satisfactory results: the tube had almost no pinholes; the few pinholes present were shallow and met the specifications; noted that there were carbides on the outer surface of the tube with a content of 8% and a thickness of 35 μm of ferritic iron. When the tube was demoulded, it was observed that the area that did not remain attached to the wet spray product was only more than 2% of its surface. The scum was collected in the joint where a 15 mm thick band formed.

Embodiment 2

[0058] The mixture is prepared from the following components:

[0059] -93% is ferrosilicon with particle size less than 200μm, which contains 65.5% silicon, 1.3% calcium and 0.95% aluminum;

[0060] - 3% magnesium metal powder with particle size between 200 and 400 μm; and

[0061] -4% is fluorite with particle size less than 150 μm.

[0062] Particle size analysis showed that 28% of it had a particle size of less than 63 μm and 97% had a particle size of less than 200 μm.

[0063] Under the same conditions, as used in Example 1, the product gave the following results: the tube had almost no pinholes; the few pinholes exhibited were shallow and met the specifications; note that in the tube There is ferritic iron with a carbide content of 10% and a thickness of 30 μm on the outer surface. These results are satisfactory. The thickness of the scum band in the joint was only 5 mm. However, the percentage of surface area of ​​the tube without wet sprayed product increased to ...

Embodiment 3

[0065] The mixture is prepared from the following components:

[0066] - 77% is ferrosilicon with particle size less than 200 μm, which contains 65.5% silicon, 1.3% calcium and 0.95% aluminum;

[0067] - 3% magnesium metal powder with a particle size of 200 to 300 μm; and

[0068] -20% is fluorite with particle size less than 350 μm.

[0069] Particle size analysis showed that 24% of it had a particle size of less than 63 μm and 95% had a particle size of less than 200 μm.

[0070] Under the same conditions, as used in Example 1, the product gave satisfactory results for all parameters: the tube was almost free of pinholes; the few pinholes present were shallow and able to meet Specification requirements; note that ferritic iron with a carbide content of 10% and a thickness of 35 μm is present on the outer surface of the pipe. The thickness of the scum band in the joint was 7 mm. The percentage of surface area of ​​the tube without wet sprayed product was only 3%.

[0071...

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Abstract

The present invention relates to a powdered product for the protection of molds or chilled molds, which product is dry sprayed on a first wet sprayed layer, comprising components common to dry sprayed products other than calcium silicide alloys, and wet sprayed Additive used to ensure that the product initially applied to the permanent mold adheres to the tube when it is demolded. The additive may be an alkaline carbonate or an alkaline silicate such as sodium silicate in which the mass percent ratio between silicon dioxide and sodium oxide is 1 to 3, or anhydrous Sodium silicate, and a mixture of one or more of them in any proportion.

Description

technical field [0001] The present invention relates to a powdered product of the dry spray type for use in combination with a wet spray type substrate to protect molds for centrifugal casting of cast iron pipes; the molds used are commonly referred to as "coquille" . Background technique [0002] Unless otherwise stated, all numerical values ​​relating to chemical components are expressed in mass percent. [0003] Coatings for the protection of centrifugal chill molds for cast iron pipe (rev tement) can include powdered modifiers and refractory materials, as well as mixtures of silica and bentonite, which are placed in place by spraying an aqueous suspension. Such coatings are described, for example, in US patent document US4058153 (applicant Pont-A-Mousson) and are known as wet-sprayed coatings. [0004] Typically powders are used which are dry sprayed onto chilled molds prior to casting iron parts, so these powders are known as dry spray powders. [0005] In cases wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D13/10
CPCB22D13/102B22D13/10B22C1/02B22C3/00
Inventor 托马斯·马尔加里亚罗朗·西克拉里
Owner PECHINEY ELECTROMETALLURGIE
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