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Sintered preparation method of iron-based metal ceramic material with high TiC content

A technology for iron-based metal and ceramic materials, applied in the field of preparation of iron-based metal-ceramic materials, can solve the problems that the material properties are difficult to meet the application requirements, the sintered porosity is difficult to reduce, the high temperature strength and hardness are insufficient, etc. Wettability, effect of high TiC content

Inactive Publication Date: 2012-04-11
王华彬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although this type of iron-based cermet has high hardness at room temperature, its high-temperature strength and hardness are insufficient, which makes it difficult to give full play to the advantages of cermet
This type of iron-based cermet has two grades in my country, GT35 and R5 (TiC ceramic content is 35wt% and 40wt%), and its hardness in the annealed state is only HRC46 and HRC48, which is difficult to meet the high temperature (such as high-speed cutting) requirements
For iron-based cermets with a TiC content of more than 45wt%, it is difficult to reduce the sintered porosity and the material properties cannot meet the application requirements. So far, there has been no practical application report at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: the formula of iron-based cermet: 50wt% 400 mesh TiC powder, Fe powder is 39wt%, Mo powder is 1wt%, Ni powder is 4wt%, Cr powder is 5wt%, Si powder is 1wt%, above The particle size of the metal powder is 200 mesh. After the prepared powder is mixed evenly, it is first pressed into a blank of 10 x 10 x 2 cm; then the blank is placed in a vacuum furnace; then, vacuum is drawn; then the temperature is raised to 200°C at a rate of 10°C / min; 10 minutes; then increase the temperature to 400°C at a rate of 10°C / min, and keep it for 10 minutes; then increase the temperature at a rate of 10°C / min, keep it at 200°C for 10 minutes, until the sintering temperature is 1450°C, after sintering for 4 hours , with the furnace cooling to room temperature, a fully dense cermet can be obtained. The hardness of cermet reaches HRC67, the three-point bending strength reaches 1000MPa, the elastic modulus is 250GPa, and the density is about 5.67g / cm 3 , the fracture toughness is...

Embodiment 2

[0009] Embodiment 2: The formula of iron-based cermet: 400 mesh TiC powder and TiN powder are 50wt% and 5wt% respectively, 201 stainless steel powder is 40wt%, Mo powder is 2wt%, Ni powder is 2wt%, Ti powder is 1wt% . The particle size of the above metal powders are all 200 mesh. After the prepared powder is mixed evenly, it is first pressed into a blank of 10 x 10 x 2 cm; then the blank is placed in a vacuum furnace; then, vacuum is drawn; then the temperature is raised to 200°C at a rate of 10°C / min; 10 minutes; then increase the temperature to 400°C at a rate of 10°C / min, and keep it for 10 minutes; then increase the temperature at a rate of 10°C / min, keep it at 200°C for 10 minutes, until the sintering temperature is 1450°C, after sintering for 4 hours , with the furnace cooling to room temperature, a fully dense cermet can be obtained. The hardness of cermet reaches HRC69, the three-point bending strength reaches 900MPa, the elastic modulus is 270GPa, and the density is...

Embodiment 3

[0010] Embodiment 3: The formula of iron-based cermet: 400 mesh TiC powder and TiN powder are 70wt% and 5wt% respectively, Fe powder is 17wt%, Mo powder is 1.25wt%, Ni powder is 2wt%, Cr powder is 3.75wt% %, Ti powder is 1wt%. The particle size of the above metal powders are all 200 mesh. After the prepared powder is mixed evenly, it is first pressed into a blank of 10 x 10 x 2 cm; then the blank is placed in a vacuum furnace to evacuate; then the temperature is raised to 200°C at a rate of 10°C / min; heat preservation for 10 minutes; Then increase the temperature to 400°C at a rate of 10°C / min, and keep it warm for 10 minutes; in this way, increase the temperature at a rate of 10°C / min, and keep it at 200°C for 10 minutes until the sintering temperature is 1450°C. After sintering for 4 hours, the furnace After cooling to room temperature, a fully dense cermet can be obtained. The hardness of cermet reaches HRC74, the three-point bending strength reaches 900MPa, the elastic m...

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PUM

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Abstract

The invention discloses a method for preparing an iron-based titanium carbide metal ceramic with high ceramic content through sintering. The component formulation comprises 45-80 % of TiC and 20-55 % of iron-based binder phase in percentage by weight, wherein the optimal components of the iron-based binder phase are 65-80% of Fe (Ferrum), 1-5 % of Mo (Molybdenum), 2-10 % of Ni (Nickel), 0-10 % ofMn (Manganese), 10-22 % of Cr (Chromium), 0-2.5 % of Ti (Titanium) and 0-2.5 % of Si (Silicon) in percentage by weight. The method comprises the following steps of: after uniformly mixing the powder prepared according to the formulation, pressing the powder into a 10*10*2 cm blank; and then putting the blank into a vacuum furnace and vacuumizing the furnace; next, heating up to 200 DEG C at a speed of 10 DEG C / min; preserving the heat for 10 minutes; and then heating up to 400 DEG C at a speed of 10 DEG C / min; preserving the heat for 10 minutes again; heating up at a speed of 10 DEG C / min in the same way; preserving the heat for 10 minutes every 200 DEG C until the sintering temperature is 1450 DEG C; and after sintering the blank for 4 hours, cooling the blank along with the furnace to the room temperature. According to the invention, the wettability between the iron-based binder phase and the titanium carbide ceramic phase can be largely improved so that the iron-based binder phase and the titanium carbide ceramic can be sufficiently wetted while being sintered at high temperature, thus the completely compact iron-based metal ceramic can be obtained.

Description

technical field [0001] The invention relates to a preparation method of an iron-based cermet material, in particular to a sintering preparation method of an iron-based cermet material with high TiC content. technical background [0002] Due to the limitation of tungsten and cobalt resources, many western countries focus on the development of tungsten-free cobalt cemented carbide with TiC ceramics as the reinforcement phase and nickel and nickel alloy as the binder phase, and have been mass-produced. 95% of tungsten-poor countries are gradually using TiC-Ni series cermets to replace tungsten-cobalt cemented carbide. Cermets with more abundant resources and cheaper iron and iron alloys as the binder phase are the development direction of future research. For countries like our country that are not rich in nickel resources, the development of iron-based cermets is even more meaningful. The iron-based binder phase is used to replace the nickel-based binder phase, which greatly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/10
Inventor 王华彬
Owner 王华彬
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