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Efficient metallographic mechanical polishing method for molybdenum

A high-efficiency mechanical polishing technology, applied in polishing compositions containing abrasives, preparation of test samples, etc., can solve the problems of low polishing efficiency and low quality, and achieve the effect of good polishing effect

Inactive Publication Date: 2016-09-07
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects of low polishing efficiency and low quality in the conventional polishing method of molybdenum products, the present invention provides a high-efficiency metallographic mechanical polishing method for molybdenum, which can prepare a bright and scratch-free surface and meet the requirements of metallographic observation. need

Method used

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  • Efficient metallographic mechanical polishing method for molybdenum
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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A high-efficiency metallographic mechanical polishing method for molybdenum includes the following steps: Step 1. Prepare molybdenum samples according to the metallographic sample preparation standard, and use water sandpaper with particle sizes of 80 mesh, 280 mesh, 400 mesh, and 600 mesh to treat the molybdenum sample in sequence. The surface is polished, and the polishing time for each water sandpaper is 1 min;

[0022] Step 2. According to the ratio of 1mL:110g, take Fe(NO 3 ) 3 ·9H 2 After O solution and nano iron powder are mixed into a suspension, ammonia water is added to adjust the pH of the suspension to 8.0, and polyethylene glycol with a mass of 0.8% of the mass of the nano iron powder is added. The molecular weight of the polyethylene glycol is 4000. Use after suction filtration The filter was washed with water, then dried at 80°C for 22h, the filter was calcined at 700°C for 1h, and then granulated to obtain abrasive particles; according to the abrasive partic...

Embodiment 2

[0025] A high-efficiency metallographic mechanical polishing method for molybdenum includes the following steps: Step 1. Prepare molybdenum samples according to the metallographic sample preparation standard, and use water sandpaper with particle sizes of 80 mesh, 280 mesh, 400 mesh, and 600 mesh to treat the molybdenum sample in sequence. The surface is polished, and the polishing time for each water sandpaper is 2 min;

[0026] Step 2. According to the ratio of 1mL: 100g, take Fe(NO 3 ) 3 ·9H 2 After O solution and nano iron powder are mixed into a suspension, ammonia water is added to adjust the pH of the suspension to 9.0, and polyethylene glycol with a mass of 0.3% of the mass of the nano iron powder is added. The molecular weight of the polyethylene glycol is 4000. Wash the filter with water, then dry it at 70°C for 24h, calcinate the filter at 500°C for 1.5h, and then granulate to obtain abrasive particles; according to the abrasive particles: CrO 3 :Water=10g:8.0g:950mL, t...

Embodiment 3

[0029] A high-efficiency metallographic mechanical polishing method for molybdenum includes the following steps: Step 1. Prepare molybdenum samples according to the metallographic sample preparation standard, and use water sandpaper with particle sizes of 80 mesh, 280 mesh, 400 mesh, and 600 mesh to treat the molybdenum sample in sequence. The surface is polished, and the polishing time for each water sandpaper is 1.5min;

[0030] Step two, according to the ratio of 1mL: 102g, take Fe(NO 3 ) 3 ·9H 2 After O solution and nano iron powder are mixed into a suspension, ammonia water is added to adjust the pH of the suspension to 8.5, and polyethylene glycol with a mass of 0.6% of the mass of the nano iron powder is added. The molecular weight of the polyethylene glycol is 4000. Wash the filter with water, then dry it at 85°C for 10h, calcinate the filter at 650°C for 0.5h, and then granulate to obtain abrasive particles; according to the abrasive particles: CrO 3 :Water=13g:12g:800mL,...

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Abstract

The invention discloses an efficient metallographic mechanical polishing method for molybdenum. The method comprises a step of preparing a molybdenum test sample according to a metallographic sample preparation standard and performing grinding treatment on the surface of the molybdenum test sample sequentially by virtue of waterproof abrasive paper with granularities of 80 meshes, 280 meshes, 400 meshes and 600 meshes, a step of preparing a polishing solution and a step of performing polishing by virtue of the polishing solution. According to the method, suspension is employed as the polishing solution, a special polishing effect is a combination of oxidability, brightness, low acidity and low corrosivity, a good polishing effect on molybdenum is achieved by the suspension polishing solution under the coaction of chromic anhydride and abrasive particles, a bright scratch-free surface better than that obtained by electrolytic polishing is prepared, and a metallographic observation requirement is met.

Description

Technical field [0001] The invention relates to the technical field of metallographic sample preparation of metal materials, in particular to a high-efficiency metallographic mechanical polishing method of molybdenum. Background technique [0002] Molybdenum is a refractory metal with a melting point of 2610°C. Molybdenum alloy has high high-temperature strength and excellent high-temperature creep properties. The service temperature range is 1100~1650℃, which is much higher than that of high-temperature alloys. It is an important high-temperature structural material for aerospace. Molybdenum alloys have been used in important parts of solid fuel rocket motors, and in the development of deep space exploration in space, the application of molybdenum alloys will have a broader space. [0003] In the development and application of molybdenum, porosity detection and grain size detection in metallographic testing are indispensable items, and the primary task of the metallographic testi...

Claims

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Application Information

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IPC IPC(8): G01N1/32B24B1/00C09G1/02
CPCB24B1/00C09G1/02G01N1/32
Inventor 郭海霞陈政龙李雪峰
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP