Ferriferous augite based metal ceramic and preparation method thereof

A technology of cermets and pyroxene, applied in the field of Fe/pyroxene cermets and its preparation, can solve problems such as cermet blanks, achieve good thermal stability, expand industrial applications, improve toughness and other mechanical properties

Active Publication Date: 2018-01-30
INNER MONGOLIA UNIV OF SCI & TECH
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Problems solved by technology

The technology of using water-quenched slag of sla...
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Abstract

The invention relates to a Fe/augite metal ceramic and a preparation method thereof. Slag glass ceramic water quenching powder, iron-containing substances and reducing agents serve as raw materials and are mixed to prepare the metal ceramic. According to the metal ceramic, the iron-containing substances and silicon iron serve as nucleating agents, and eutectic growth of iron and diopside is promoted, so that the toughness and other mechanical properties of the metal ceramic are improved. The Fe/augite metal ceramic has characteristics such as wear resistance, corrosion resistance and high-temperature resistance of glass ceramics, and also has toughness of metal and good heat stability. The industrial use of the metal ceramic is greatly widened, the metal ceramic is low in production cost,and the preparation method is simple and wide in application.

Technology Topic

Corrosion resistantFerrosilicon +14

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  • Ferriferous augite based metal ceramic and preparation method thereof
  • Ferriferous augite based metal ceramic and preparation method thereof
  • Ferriferous augite based metal ceramic and preparation method thereof

Examples

  • Experimental program(4)

Example Embodiment

[0043] Example 1: A Fe/pyroxene cermet and its preparation method
[0044] (1) Weigh the raw materials according to the chemical composition of the CMSA series of glass-ceramics, in which iron tailings are 55%, blast furnace slag powder 20%, quartz sand 15%, borax 2%, sodium carbonate 3%, and feldspar powder 5%;
[0045] (2) Mixing: do the ingredients as described above, and put them into the mixer for mixing;
[0046] (3) Melting material: Put the uniformly mixed raw materials into a crucible, and melt them in a high temperature resistance furnace at 1450℃ for 2 hours; (4) Preparation of water quenching slag powder: Pour the molten glass quickly into cold water to obtain water The quenched glass particles are then ground in a ball mill to a particle size of 200 meshes to obtain slag-ceramic glass water-quenched slag powder; its composition is shown in Table 2;
[0047] (5) Ingredients: measure 100 parts of water quenched slag powder, Fe 2 O 3 Mix 15 parts of powder and 20 parts of ferrosilicon alloy powder containing 75% by weight of Fe;
[0048] (6) Mixing: Put the mixture into a ball milling tank and mill it for 1 hour at room temperature to make the powder evenly dispersed.
[0049] (7) Forming: The dispersed powder is pressed into a blank by a press, the forming pressure is 50MPa, and then the isostatic pressing is performed at a pressure of 180MPa;
[0050] (8) Sintering: The formed blank is placed in an atmosphere furnace, and a flow of 0.5L/min of nitrogen is introduced. The temperature is raised to 800°C at a heating rate of 8°C/min, and the temperature is kept for 3 hours; naturally cooled to 200°C and stopped. Nitrogen, continue to cool to room temperature and take out the sample.
[0051] The sample is similar to figure 1 As shown, the microstructure of the sample can be seen figure 2 , The performance index of the sample is shown in Table 3. From figure 2 It can be seen that in Fe/pyroxene cermet, Fe can act as a nucleating agent to promote the growth of the pyroxene phase. It can be seen from Table 3 that Fe is added 2 O 3 The toughness and thermal stability of Fe/pyroxene cermet prepared from powder and Fe-75% Si alloy powder are significantly higher than those of the control group (without Fe added 2 O 3 CAMS slag glass ceramics (sintered type) with ferrosilicon).
[0052] Table 3 Performance indicators of the samples of the invention
[0053]

Example Embodiment

[0054] Embodiment 2: A Fe/pyroxene cermet and its preparation method
[0055] (1) Ingredients: 100 parts of glass-ceramic water quenched slag powder, Fe 2 O 3 15 parts of powder and 25 parts of ferrosilicon alloy powder containing 75% (by weight) Fe are mixed; the chemical composition of the glass-ceramic water quenched slag is shown in Table 2;
[0056] (2) Mixing: Put the mixture into a ball milling tank and mill it for 1 hour at room temperature to make the powder uniformly dispersed;
[0057] (3) Pressing: the dispersed powder is pressed into a blank by a press, the forming pressure is 50MPa, and the pressure is 180MPa for isostatic pressing;
[0058] (4) Sintering: the formed blank is placed in an atmosphere furnace, and nitrogen is introduced at a flow rate of 0.5L/min. The temperature is raised to 800°C at a heating rate of 8°C/min, and the temperature is kept for 3 hours; it is naturally cooled to 200°C and stopped. Nitrogen, continue to cool to room temperature and take out the sample.
[0059] The performance indicators of the samples are shown in Table 3. It can be seen from Table 3 that the toughness and thermal stability of Fe/pyroxene cermet prepared by adding Fe-75% Si are slightly higher than those of Example 1.

Example Embodiment

[0060] Embodiment 3: A Fe/pyroxene cermet and its preparation method
[0061] (1) Ingredients: measure 100 parts of water quenched slag powder prepared in Example 1, Fe 2 O 3 Mix 10 parts of powder, 30 parts of iron concentrate powder, and 50 parts of ferrosilicon alloy powder containing Fe 65% (weight);
[0062] (2) Mixing: Put the mixture into a ball milling tank and mill it for 2 hours at room temperature to make the powder uniformly dispersed;
[0063] (3) Pressing and sintering: the dispersed powder is placed in a graphite mold, first molded under a pressure of 10MPa, and then placed in a spark plasma sintering furnace (SPS) for sintering, with a heating rate of 35°C/min The temperature is increased to 800°C, and the pressure is gradually increased to 50 MPa at the same time, the temperature is kept for 20 minutes, and the furnace is cooled to room temperature and taken out.
[0064] The density of the sintered sample was measured by the drainage method, and its microhardness was measured. It was found that its density reached 3.2g/cm 2 , Higher than the density of CAMS slag glass-ceramics (sintered type) (2.6g/cm 2 ); The microhardness is 750HV, which is higher than the microhardness (510HV) of the CAMS slag glass-ceramics (sintered type). The indentation diagram of the Vickers hardness of the sample is as follows Figure 4 Shown by Figure 4 It can be seen that when there is no metal phase at the edges and corners of the indentation, an extended crack will occur, such as Figure 4 (a), but when there is a metal phase, there is no propagation crack, such as Figure 4 (b) It can be seen that the presence of the metallic iron phase improves the toughness of Fe/pyroxene cermet.

PUM

PropertyMeasurementUnit
Microhardness750.0hV
Microhardness510.0hV
Microhardness700.0hV

Description & Claims & Application Information

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