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

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...

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.