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RE-containing prealloy powder

A pre-alloyed powder, rare earth technology, applied in the field of diamond tool manufacturing, can solve the problems of high diamond degradation, low hardness, strength and wear resistance of sintered blocks, and shortened life of sintered molds.

Active Publication Date: 2007-06-27
GRIPM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High sintering temperatures lead to the following major disadvantages: reduced sintering tool life, diamond degradation and high energy consumption
[0007] From a technical point of view, the use of fine cobalt powder brings good results for diamond tools; however, the use of cobalt also has some disadvantages: one of the main disadvantages is the high price of cobalt powder and strong price fluctuations. At the same time, cobalt is also Suspected of being hazardous to the environment
However, when using a fine metal powder mixture as the binder powder, since the uniformity of the mixture powder has a substantial impact on the mechanical properties of the final tool, the hardness, strength and wear resistance of the obtained sintered agglomerate are all poor. relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: Preparation of Fe-Cu-Co-Mn-La pre-alloyed powder

[0017] This example relates to the preparation of the prealloyed powders of the present invention by using oxalic acid as a precipitating agent and the reduction reaction of the precipitated oxalate complex.

[0018] Under stirring at 90°C, add the sulfate and chloride mixed salt solution containing 75g / l Fe, 43g / l Cu, 45g / l Co, 5g / l Mn, 3g / l La to the solution containing 126g / l C 2 h 2 o 4 ·H 2 Add ammonia water to the oxalic acid aqueous solution of O to adjust the pH value to 4.5. Allow 1 hour to complete the reaction. In this way, 82% of Fe, 88% of Cu, 95% of Co, 48% of Mn, and 75% of La are precipitated in the form of mixed oxalate.

[0019] The precipitate was washed by filtration with purified water until the filtrate had a pH of 7 and was substantially free of sulfate and Cl. The precipitate was dried at 100°C.

[0020] The above precipitate was reduced in a reduction furnace using hydrogen ...

Embodiment 2

[0022] Embodiment 2: Preparation of Fe-Cu-Sn-Ce pre-alloyed powder

[0023] This example relates to the preparation of the prealloyed powders of the present invention by using oxalic acid as a precipitating agent and the reduction reaction of the precipitated oxalate complex.

[0024] Under stirring at 90°C, add sulfate and chloride mixed salt solution containing 75g / l Fe, 40g / l Cu, 7g / l Sn, 1g / l Ce to 126g / l C 2 h 2 o 4 ·H 2 Add ammonia water to the oxalic acid aqueous solution of O to adjust the pH value to 4.5. Allow 1 hour to complete the reaction. In this way, 82% of Fe, 88% of Cu, 55% of Sn, and 80% of Ce are precipitated in the form of mixed oxalate.

[0025] The precipitate was washed by filtration with purified water until the filtrate had a pH of 7 and was substantially free of sulfate and Cl. The precipitate was dried at 100°C.

[0026] The above precipitate was reduced in a reduction furnace using hydrogen as the reducing atmosphere at 680°C for 7 hours to o...

Embodiment 3

[0028] Embodiment 3: Sintering experiment of pre-alloyed powder

[0029] This example concerns the determination of the sinterability of Powder 1 and Powder 2 according to the invention.

[0030] The following method is used to measure the sinterability of the powder: the powder is placed in a graphite mold with a size of 40mm×5mm×5mm, the pressure is 35MPa, sintered at different temperatures for 3 minutes, and the relative density of the sintered block is measured. The results are shown in Table 1.

[0031] Table 1 Relative density of sintered powder

[0032] powder

[0033] The results show that powder 1 and powder 2 can obtain higher sintered density at lower sintering temperature. Sintering above 850°C does not increase the relative density of powder 1 and powder 2.

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Abstract

The present invention relates to a kind of pre-alloyed powder and its application in making diamond tool. The pre-alloyed powder consists of at least two selected from Fe, Co, Cu and Ni as basic components, one or several of Mn, Ti, Sn, Mo, W and WC, and one or two of RE, such as La and Ce. It contains at most 80 % of Fe, at most 40 % of Co, at most 80 % of Cu, at most 40 % of Ni, at most 8 % of M and 0-5 % of RE, where, M is one or several of Mn, Ti, Sn, Mo, W and WC and RE is La and / or Ce. The pre-alloyed powder has also inevitable impurity. Scanning electronic microscope measurement shows that the pre-alloyed powder has basic particle size smaller than 15 micron and oxygen content not more than 2 %. The pre-alloyed powder is used as adhesive in making diamond tool.

Description

technical field [0001] The invention relates to the preparation of a prealloyed powder and its application in the manufacture of powder metallurgy parts, especially diamond tools. The pre-alloyed powder involved in the invention is basically composed of at least two selected from Fe, Co, Cu, and Ni, and at the same time, Mn, Ti, Sn, Mo, W, WC and rare earth elements are added as strengthening elements. One or more, such as La or Ce. Background technique [0002] With the intensification of competition in the industry, the demand for cost reduction and efficiency improvement in the stone and engineering construction industries has become increasingly strong, and the demand for high-performance diamond tools in the international and domestic markets has risen rapidly. [0003] There are various methods of making diamond tools. In each method, diamond is first mixed with one or more metal powders, possibly ceramic powder or organic binder powder, and then the mixture is sinte...

Claims

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Application Information

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IPC IPC(8): B22F1/00
Inventor 汪礼敏张景怀万新梁李占荣申思杨中元李学锋
Owner GRIPM ADVANCED MATERIALS CO LTD
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