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A kind of high-density massive high-purity cementite and its preparation method

A cementite and dense technology, which is applied in the field of high-density massive cementite and its preparation, can solve the problem of lack of reports on dense massive high-purity cementite

Active Publication Date: 2016-08-03
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing research, few scholars have prepared high-purity cementite, and the reports of dense massive high-purity cementite are even scarcer.

Method used

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  • A kind of high-density massive high-purity cementite and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: The preparation process is divided into three steps:

[0017] (1) Two parts of 99g ball mill raw materials, each part of 92.37g α-iron powder and 6.63g graphite powder, were placed in two 500ML hard stainless steel tanks, filled with argon gas protection, sealed, and placed in a ball mill symmetrically , after ball milling for 75h, cooled to room temperature, and then powdered. Argon is used as a protective atmosphere in the powder extraction process, and liquid nitrogen is used to cool down to prevent powder oxidation;

[0018] (2) Put the powder into the mold after ball milling, and apply zinc stearate lubricant on the inner wall of the mold sleeve and the ejector rod to facilitate demoulding. Put the mold containing the powder into the hot press furnace, close the furnace cover, and vacuumize to 3.0×10 -2 MPa, pressure 50MPa, sintering temperature 600℃, sintering time 4h. Cool down to room temperature with the furnace, and demould to obtain block sam...

Embodiment 2

[0021] Embodiment 2: the operation steps are basically the same as in Example 1: in step (1), in each powder material, 0.1g of stearic acid dispersant is additionally added, and certainly this stearic acid can also be substituted with methanol, and the effect is slightly poor; step (2) ) and the process parameters of step (3) are completely consistent with those of Example 1.

[0022] The properties of the obtained cementite were tested to obtain the following data: quantitative analysis by XRD, the content of cementite was 95.55%, and the absolute density was 7.50g / cm 3 .

Embodiment 3

[0023] Example 3: The operation steps are basically the same as those of Example 2: the process parameters of step (1) are consistent with those of Example 2; in step (2), the sintering temperature is 800° C., the sintering time is 0.5 hours, and the vacuum degree is 1.0×10 -2 MPa, pressurized 15MPa; in step (3), the degree of vacuum is 1.0×10 -2 MPa, annealing temperature 600 ℃, annealing time 1.0h.

[0024] The properties of the obtained cementite were tested and the following data were obtained: quantitative analysis by XRD, the cementite content was 96.45%, and the absolute density was 7.40g / cm 3 .

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Abstract

The invention discloses high-density bulky high-purity cementite and a preparation method thereof. The absolute density of the cementite is 7.40-7.58g / cm<3>, and the purity is greater than 92.45%. The preparation method comprises the following steps: mixing iron powder with graphite powder and mechanically alloying by way of ball milling; putting the mechanically alloyed powder in a die and carrying out hot pressing on the powder by adopting a vacuum hot pressing manner to form a bulky test sample, wherein the sintering temperature is 600-1300 DEG C and the vacuum hot pressing press is 15-85MPa; and after demoulding the bulky test sample, annealing in a vacuum annealing furnace to obtain the cementite. The cementite has the advantages that the cementite material is good in performance. By optimizing parameters of mechanical alloying and hot pressing processes and combining vacuum annealing, the high-density bulky cementite can be prepared, thereby providing an effective cementite preparation method for subsequent physical and mechanical performance tests of the cementite phase.

Description

technical field [0001] The invention relates to a cementite and a preparation method thereof, in particular to a high-density block cementite and a preparation method thereof. Background technique [0002] Cementite is an important constituent phase in steel, and its morphology and distribution in steel will have an important impact on the physical and mechanical properties of steel. The addition of alloying elements in steel will inevitably affect the properties of cementite itself. Cementite is a metal compound with a complex orthogonal structure, which is a metastable phase at all temperatures in the iron-carbon system, so the preparation of elemental cementite is particularly difficult, so that the research on the properties of cementite itself has always been a difficult point. In the existing research, few scholars have prepared high-purity cementite, and the reports of dense block high-purity cementite are even scarcer. SUMMARY OF THE INVENTION [0003] Purpose o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02C22C38/00
Inventor 涂益友张群黄羚惠蒋建清方峰周雪峰
Owner SOUTHEAST UNIV
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