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Preparation method for casting iridium crucible

A technology for crucibles and process steps, which is applied in the field of preparation of cast iridium crucibles, which can solve the problems of high processing difficulty, large processing allowance, and poor compactness, and achieve the effects of increased material utilization, good product quality, and fewer casting defects

Inactive Publication Date: 2017-01-04
陕西三毅有岩材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main technical problems of cast crucibles are as follows: 1. Cast iridium crucibles have defects such as delamination, sand inclusions, trachoma, and poor compactness, which bring hidden dangers of instability to the use of crucibles; 2. Cast iridium crucibles have material The utilization rate is low and the processing is difficult. At present, there are sprues and bosses in the casting crucible, which leads to a large processing allowance and a large invisible loss of precious metal iridium during the processing; 3. The size of the current casting iridium crucible is small and cannot be welded with rolling. crucibles of different specifications

Method used

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  • Preparation method for casting iridium crucible

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Effect test

Embodiment 1

[0015] A preparation method for casting an iridium crucible, the casting process steps are:

[0016] (1) Surface coating of the upper mold 2: a boron nitride coating of 5.0 to 10.0 microns is prepared on the surface of the upper mold 2 by chemical vapor deposition;

[0017] (2) Preheating the upper mold 2: Preheat the upper mold 2 to 1000-1500°C in an electric furnace;

[0018] (3) Smelting of metal iridium: add an appropriate amount of iridium raw material in the crucible 1, and smelt with a high-frequency induction furnace under the atmosphere until the iridium metal in the crucible 1 is completely melted, and the iridium metal liquid level is calm and no bubbles emerge;

[0019] (4) Iridium crucible molding: Insert the preheated upper mold 2 into the crucible 1 of molten iridium metal, close the vacuum high-frequency induction furnace door to evacuate, control the vacuum degree of the chamber below 1Pa, and then gradually reduce it The current of the high-frequency inducti...

Embodiment 2

[0024] The cast iridium crucible has an outer diameter of 66mm, an inner diameter of 60mm, a wall thickness of 3mm, and a bottom thickness of the crucible of 3-5mm;

[0025] Cast iridium crucible manufacturing process:

[0026] 1.1 According to the iridium crucible specification requirements and figure 1 Customize the zirconia ceramic crucible 1 and the upper mold 2 of corresponding specifications, and coat the part of the upper mold 2 in contact with the iridium metal liquid with a boron nitride coating of 5.0-10.0 microns by chemical vapor deposition.

[0027] 1.2 Put the melting pot and upper mold 2 into the electric furnace and heat to 500-600°C. After 120 minutes of heat preservation, take out the melting pot and install it on the high-frequency induction coil to melt iridium metal, and the upper mold 2 will heat up to 1000-1500 Keep warm between ℃ for later use.

[0028] 1.3 Confirm that the iridium metal block or powder in the crucible 1 is completely melted, and cont...

Embodiment 3

[0033] The cast iridium crucible has an outer diameter of 120mm, an inner diameter of 114mm, a wall thickness of 3mm, and a bottom thickness of the crucible of 3-5mm;

[0034] Cast iridium crucible manufacturing process:

[0035] 2.1 According to the iridium crucible specification requirements and figure 1 Customize the zirconia ceramic crucible 1 and the upper mold 2 of corresponding specifications, and coat the part of the upper mold 2 in contact with the iridium metal liquid with a boron nitride coating of 5.0-10.0 microns by chemical vapor deposition.

[0036] 2.2 Put the melting pot and upper mold 2 into the electric furnace and heat to 500-600°C. After 120 minutes of heat preservation, take out the melting pot and install it on the high-frequency induction coil to melt iridium metal, and the upper mold 2 will heat up to 1000-1500 Keep warm between ℃ for later use.

[0037] 2.3 Confirm that the iridium metal block or powder in the crucible 1 is completely melted, and co...

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Abstract

The invention discloses a preparation method for casting an iridium crucible. The casting technology includes the steps that (1) the surface of an upper mold 2 is coated, and a boron nitride coating of 5.0-10.0 microns is prepared on the surface of the upper mold 2 through a chemical vapor deposition method; (2) the upper mold 2 is preheated, and the upper mold 2 is preheated to 1000-1500 DEG C in an electric furnace; (3) metal iridium is smelted; (4) the iridium crucible is formed; and (5) the iridium crucible is machined and cleaned. The preparation method has the advantages of being high in production efficiency, high in yield, good in product quality, numerous in number of specifications and the like. The production efficiency is improved by more than 20% in the manufacturing process of the cast crucible, the material utilization rate is increased by more than 30%, the number of product casting defects is small, and cost is greatly reduced. The production requirements for the diversification, high efficiency, high yield, low cost and short production cycle of the cast iridium crucible can be met.

Description

technical field [0001] The invention belongs to the preparation technology of a casting iridium crucible, in particular to a preparation technology of a casting iridium crucible. Background technique [0002] The melting point of iridium is as high as 2440°C, and it has good corrosion resistance and high temperature oxidation resistance, especially in high temperature fields. Iridium crucible is an important precious metal container material, which can be used for refractory oxide crystals, such as artificial crystals, artificial gemstones, sapphire and other industries. The crucible can work at 1800-2200 °C for thousands of hours without breaking, and the surface should be smooth and clean. The dense internal structure does not allow metallurgical defects such as delamination, pores, sand inclusions, sand holes, cracks, etc., and the density is not less than 21.0g / cm 3 . At present, the main technical problems of cast crucibles are as follows: 1. Cast iridium crucibles ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D23/06B22D19/08
CPCB22D23/06B22D19/08
Inventor 孙岩杨德江王丹吕啸天翟笑冬陈刚超周立宽刘超庞继明
Owner 陕西三毅有岩材料科技有限公司
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