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Preparation method of precision casting fused quartz powder and quartz powder produced by same

A technology of fused silica powder and precision casting, which is applied in the field of investment precision casting, can solve the problems of difficult to control the uniformity and stability of grading particles, difficult to meet production needs, and complicated process, so as to reduce the particle grading process, The effect of improving production efficiency and simple process

Active Publication Date: 2013-06-05
LIANYUNGANG RISTAR ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although studies have shown that the use of fused silica powder in coatings can be improved by grading and spheroidizing the particles, there are still problems such as difficult control of the uniformity and stability of the gradation particles, complicated process and high cost. problems, it is difficult to meet the actual production needs

Method used

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  • Preparation method of precision casting fused quartz powder and quartz powder produced by same
  • Preparation method of precision casting fused quartz powder and quartz powder produced by same
  • Preparation method of precision casting fused quartz powder and quartz powder produced by same

Examples

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preparation example Construction

[0021] A preparation method of fused silica powder for precision casting:

[0022] (1) Use a hammer crusher to crush the massive quartz stone into 4-10 mesh quartz sand, sort and remove impurities such as feldspar and mica, and use a drum dry magnetic separator for magnetic separation at a field strength of 6000-7000 Gauss;

[0023] (2) Use the pickling device equipped with an ultrasonic generator to pickle and remove impurities from the quartz sand. The lining material of the pickling tank is polytetrafluoroethylene, the ultrasonic frequency is 25-35Hz, the ultrasonic power is 400-600W, and hydrochloric acid is used. : Mixed acid with a mass ratio of oxalic acid of 1-2:1, the dosage is 30-40kg / t each time, and the temperature is room temperature; the specific process is: use the mixed acid solution to soak the quartz sand for 3-5 hours, stir 2-3 times in the middle, Then treat it in the ultrasonic field for 40-60 minutes, and flow away the surface solution;

[0024] (3) Use ...

specific Embodiment approach 1

[0033]Specific embodiment 1, use a hammer crusher to crush a certain amount of quartz stone into 4-10 mesh quartz sand, pick out impurities such as feldspar and mica, and put it into a drum dry magnetic separator for magnetic separation under a field strength of 7000 gauss . Place the magnetically separated quartz sand in a pickling device equipped with an ultrasonic generator, add a mixed acid (hydrochloric acid: oxalic acid ratio of 1:1) solution at a rate of 40kg / t to soak for 4 hours at room temperature, stir twice in the middle, and then Treat for 60 minutes under the action of ultrasonic field (frequency 35Hz, power 400W), and flow away the surface solution. Put the pickled quartz sand into a container, add pure water to soak at room temperature for 2.5 hours, and then wash it in an ultrasonic field (frequency 20Hz, power 100W) for 30 minutes. Put the washed quartz sand into an oven, dry it in an air atmosphere at 300°C for 3 hours, take it out and cool it to room tempe...

specific Embodiment approach 2

[0035] The difference between this embodiment and Embodiment 1 is that the ball milling time is 70 min, the ball mill speed is 50 r / min, and other steps and parameters are the same as Embodiment 1. Prepared fused silica powder is recorded as 2# product. The product SiO 2 The purity is 99.91%, and the particle size distribution range is shown in the attached figure 2 , the median particle size is 27.2 μm, the average particle size is 37.2 μm, and the rheological viscosity of the configured silica sol coating (powder-liquid ratio is 1.75) is 28.27s.

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Abstract

The invention relates to a preparation method of precision casting fused quartz powder and quartz powder produced by the method. The preparation method comprises the following steps of: smashing, sieving, purifying, fusing by an electric furnace, smashing, dry type ball-milling and sieve for a quartz raw material to obtain a product. An ultrasonic field is introduced in the scouring purifying and washing process of quartz, so that the content of impurities in powder is effectively reduced, and the step time is greatly shortened and the production efficiency is improved. Full grain fused quartz powder required is directly obtained by optimizing ball-milling process parameters and adopting a unique feeding mode, so that the grain composition step in conventional method is reduced. The method is simple in technical process, short in period, low in energy consumption and low in cost, and is beneficial for large-scale batch production. The fused quartz powder produced is high in purity, wide in grain distribution, free from graduation, mellow and full on surface of grains and good in rheological property of paint, and can be better applied to the field of investment casting and can partially or completely replace expensive shell material zircon power, so that the production cost of precision casting is effectively reduced.

Description

technical field [0001] The invention relates to the field of investment precision casting, in particular to a method for preparing fused silica powder for precision casting and the quartz powder produced by the method. Background technique [0002] The investment casting process is to use fusible materials to make a fusible model, coat it with several layers of special refractory coatings, dry and harden to form an integral shell, and then melt the model in the shell and put it in Roasting at high temperature in a roasting furnace, and finally pouring molten metal into the shell to obtain a casting. This casting process can produce metal parts that are precise and complex, close to the final shape of the product, and can be used directly without or with little processing, so it has a clear advantage in the manufacture of high-end castings. One of the important basic technologies in the field. [0003] Shell making is one of the key processes in the production of investmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B20/00C01B33/12
CPCY02P40/57
Inventor 冯立超刘成文段世领
Owner LIANYUNGANG RISTAR ELECTRONICS MATERIALS
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