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FeMnNi powder accelerant with low cost and preparation method and application

A low-cost, powder-based technology, used in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. The effect of enhancing the ability to dissolve carbon and increasing the nucleation rate

Inactive Publication Date: 2015-01-21
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The chemical components of the above powder catalyst patents are all NiMn-based or FeNi-based, containing a relatively high proportion of Ni, so the cost of catalyst materials is relatively high

Method used

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  • FeMnNi powder accelerant with low cost and preparation method and application
  • FeMnNi powder accelerant with low cost and preparation method and application
  • FeMnNi powder accelerant with low cost and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The low-cost powder catalyst in this embodiment has an alloy composition of 35% Mn, 8% Ni, 1% Cr, 0.2% C, 0.06% Si, and the balance is Fe. The powder preparation method is as follows:

[0028] 1. Weigh Fe, Mn, Ni, Cr, C, and Si according to the proportion of the formula, and use an intermediate frequency induction furnace to melt and make ingots under the protection of inert gas. The melting temperature of the ingredients is about 1460-1480 ° C, considering the volatilization of Mn elements Mn should be added at the later stage of melting, after adding Mn and melting, keep it for about 5 minutes, and then cast it into an ingot.

[0029] 2. Remelt the alloy ingot at 1460-1650°C. During the melting process, pass through argon gas for protection. The ventilation time is about 10 minutes. Finally, use high-pressure nitrogen gas (pressure 3.0-4.5Mpa) to crush and atomize the metal liquid flow into powder .

[0030] The catalyst powder of the formula was prepared by the abo...

Embodiment 2

[0035]The preparation equipment and operating method of the powder catalyst are the same as in Example 1, except that, by mass percentage, the batching composition of the catalyst alloy is 40% Mn, 8% Ni, 1% Cr, 0.2% C, 0.06% Si, and the remaining The amount is Fe. The oxygen content of the catalyst powder was measured to be 263 ppm and the nitrogen content to be 145 ppm.

[0036] After sieving the alloy powder, take -325 mesh catalyst powder and graphite powder and mix uniformly at a ratio of 4:6 to prepare a synthetic rod. Also use a Φ40mm cavity at a pressure of about 5.4Gpa, a temperature above 1450°C, and a heating time of about 15 minutes Diamond synthesis was carried out under the following conditions, and the obtained diamond was subjected to particle size analysis, color, shape observation and static pressure strength test. The test results are shown in Table 1.

Embodiment 3

[0038] The preparation equipment and operating method of the powder catalyst are the same as in Example 1, but the difference is that, by mass percentage, the batching composition of the catalyst alloy is 45% Mn, 8% Ni, 1% Cr, 0.2% C, 0.06% Si, and the remaining The amount is Fe. The oxygen content of the catalyst powder was measured to be 280 ppm and the nitrogen content to be 168 ppm.

[0039] After sieving the alloy powder, take -325 mesh catalyst powder and graphite powder and mix uniformly at a ratio of 4:6 to prepare a synthetic rod. Also use a Φ40mm cavity at a pressure of about 5.4Gpa, a temperature above 1450°C, and a heating time of about 15 minutes Diamond synthesis was carried out under the following conditions, and the obtained diamond was subjected to particle size analysis, color, shape observation and static pressure strength test. The test results are shown in Table 1.

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Abstract

The invention relates to a FeMnNi powder accelerant with low cost, wherein the alloy comprises the components in percentage by weight as follows: 30-50% of Mn, 0-10% of Ni, 1-3% of Cr, 0.1-0.8% of C, 0.05-0.2% of Si and the balance of Fe. The oxygen content of a powder accelerant product optimized is less than or equal to 300ppm, and the nitrogen content is less than or equal to 180ppm. The accelerant is prepared by a gas atomization process of inertial gas, so that the accelerant powder is spherical or approximately spherical with uniform alloy composition. Diamond synthesized by the accelerant and graphite in proportion is greyish-green or dark green in color, and the crystal form of the diamond is a polygonal aggregate in a granular structure. The per mixed unit yield reaches over 154 carat / block by cavity with diameter of 40mm, the static pressure strength is average about 20N, and the coarsness proportion of 80 / 100 reaches over 60%, so that the accelerant is an ideal raw material for manufacturing an efficient diamond grinding apparatus for crisp and hard materials.

Description

technical field [0001] The invention relates to a low-cost FeMnNi powder catalyst and its preparation method and application. The low-cost FeMnNi powder catalyst prepared by the invention can be applied to artificially synthesized self-sharpening diamond, and belongs to the technical field of catalyst materials for artificially synthesized diamond. Background technique [0002] The catalysts commonly used in synthetic diamonds are as follows: De Beers uses cobalt-based and nickel-based alloy catalysts; G.E Company uses nickel-based catalysts; Russia uses nickel-manganese catalysts; my country uses nickel-manganese-cobalt or nickel-manganese-iron catalysts and iron-nickel catalysts. Considering that the production of self-sharpening diamond requires high output, that is, high conversion rate, low cost, equal-area particle shape, and aggregate crystal structure, the requirements for single crystal, complete crystal form, and high-strength indicators are not emphasized. my coun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J35/02C01B31/06B01J35/00C01B32/26
Inventor 赵文东徐骏赵新明张永忠边隽杰
Owner GRIMAT ENG INST CO LTD
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