CN102383022A

CN102383022A - Method for preparing high-TiC-content iron base metal ceramic material through combustion synthesis

Info

Publication number: CN102383022A
Application number: CN2011103590219A
Authority: CN
Inventors: 王华彬
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-11-14
Filing date: 2011-11-14
Publication date: 2012-03-21
Anticipated expiration: 2031-11-14
Also published as: CN102383022B

Abstract

The invention discloses a method for preparing high-ceramic-content iron base titanium carbide metal ceramic with a combustion synthesis method. A formula of the ceramic comprises the ingredients as follows: TiC is 45-80 percent by weight; the content of an iron base binder phase is 20-55 percent by weight; and the best ingredients of the iron base binder phase comprise the following ingredients in percentage by weight: 65-80 percent of Fe, 1-5 percent of Mo, 2-10 percent of Ni, 0-10 percent of Mn, 10-22 percent of Cr, 0-2.5 percent of Ti and 0-2.5 percent of Si. The method comprises the following steps of: uniformly mixing prepared iron base metal ceramic powder and pressing into a blank of 10cm*10cm*2 cm; placing the blank in a mould and vacuumizing; and electrifying for ignition, compressing for compaction after 100 seconds to obtain fully compact iron base metal ceramic. By adopting the method, wettability between the iron base binder phase and a titanium carbide ceramic phase can be greatly improved, so that the iron base binder phase and the titanium carbide ceramic can be fully wetted during high-temperature sintering, and further, the fully compact iron base metal ceramic can be obtained.

Description

The burning synthesis for preparing Preparation Method of high TiC content iron base metal ceramics material

Technical field

The present invention relates to a kind of iron base metal ceramics preparation methods, particularly relate to a kind of iron base metal ceramics material preparation method of high TiC content.

Technical background

Because the restriction of tungsten and cobalt resource, it is wild phase that many western countries give priority to the TiC pottery, and nickel is bonding no tungsten-cobalt hard alloy mutually with nickelalloy, and has obtained batch process.It is that sintering metal substitutes tungsten-cobalt hard alloy that 95% poor tungsten country all uses TiC-Ni gradually.With resource horn of plenty more, the developing direction that the cheaper iron of price and iron alloy then are future studies as bonding sintering metal mutually.This is for resembling the not abundant country of the such nickel resources of China, and the meaning of exploitation iron base metal ceramics is just bigger.Replace Ni-based bonding phase mutually with iron-based binder, greatly reduce the preparation cost of iron base metal ceramics.Its preparation cost has only the half the of nickel based metal pottery.For solid basis has been established in ceramic-metallic large-scale commercial applications popularization.Because the chemically reactive of iron is high than cobalt and nickel; Be easier to oxidation; The wettability of itself and TiC is also poor than nickel and cobalt, adds that the liquid phase sintering temperature wants high many than nickel based metal is ceramic, and the performance of the iron base metal ceramics of development is still undesirable both at home and abroad at present; Particularly the key index porosity is excessive, has seriously restricted its application under industry special operation conditions such as space flight, navigation, military project.At the iron base metal ceramics of low TiC content (40wt% below),, obtain high firmness through thermal treatment process then owing to this type iron base metal ceramics can be eliminated the hole that exists some amount in the matrix behind the sintering through high temperature forging technology.Though but this type iron base metal ceramics room temperature has very high hardness, it is not enough that hot strength and hardness but seem, this just is difficult to give play to ceramic-metallic advantage.There are GT35 and R5 (the TiC ceramic content is respectively 35wt% and 40wt%) in this type iron base metal ceramics China) two kinds of trades mark, its hardness in annealed state has only HRC46 and HRC48 respectively, is difficult to satisfy high temperature (like high speed cutting) demand.Surpass the iron base metal ceramics more than the 45wt% for TiC content, because the sintering porosity is difficult to reduce, material property is difficult to satisfy application demand, and reporting for work of the practical application of obtaining do not arranged so far both at home and abroad as yet.

Summary of the invention

The burning synthesis for preparing Preparation Method that the purpose of this invention is to provide a kind of iron base metal ceramics material of high TiC content.Through lot of test and optimization; Obtain the best composition of iron-based bonding phase, made the iron-based bonding when high-temp combustion is synthetic, can be fully wetting with the TiC ceramic phase; Even under the situation of high TiC ceramic content, also can obtain near fine and close fully iron base metal ceramics.

The burning synthesis for preparing Preparation Method of the high TiC content of the present invention iron-based titanium carbide ceramic is such (greater than TiC content of 45wt%).The composition prescription of iron base metal ceramics is: TiC is 45wt%-80wt%, and the content of iron-based bonding phase is at 20wt%-55wt%; Wherein the best composition of iron-based bonding phase is: Fe is 65 wt%-80wt%, and Mo is 1 wt%-5wt%, and Ni is 2 wt%-10wt%; Mn is 0wt%-10wt%; Cr is 10 wt%-22wt%, and Ti is 0 wt%-2.5wt%, and Si is 0 wt%-2.5wt%.With the above powder for preparing evenly after, be pressed into the blank of 2 centimetres of 10 x, 10 x; Then blank is put into mould, vacuumize; Energising is ignited then, and after 100 seconds, the pressurization densification just can obtain fine and close fully iron base metal ceramics.

In order to have reduced the oxidation of iron powder in the iron base metal ceramics sintering process, improve the performance of preparing iron base metal ceramics, the iron during iron-based bonds mutually also can substitute with Stainless Steel Powder and add.

In the composition prescription of above-mentioned iron base metal ceramics, the available TiN of the part of TiC replaces, and the replacement amount of TiN is no more than the 5wt% of TiC.

Because the present invention can improve the wettability between iron-based bonding and the titanium carbide ceramic phase greatly, make that iron-based bonding and titanium carbide pottery can be fully wetting when high-temp combustion is synthetic, thereby can obtain fine and close fully iron base metal ceramics.TiC content in the sintering metal of preparation is high, and its hardness is hard, and wear resistance and high-speed cutting performance are good, and its proportion is low, suit at high speed cutting tool, and high temperature and high speed bearing and gear, tank armor, the aerospace parts, and use on other high-temperature wearable part.

Embodiment

Embodiment one: the prescription of iron base metal ceramics: the Ti powder is 40wt%, and carbon black is wt11%, and the Fe powder is 39wt%, and the Mo powder is 1wt%, and the Ni powder is 4wt%, and the Cr powder is 5wt%, and the Si powder is 1wt%, and the granularity of above metal powder is 200 orders.The powder for preparing after mixing, the blank that at first downtrodden 10 x, 10 x 2 centimetres; Then blank is put into mould; Then, vacuumize; Energising is ignited then, and after 100 seconds, the pressurization densification just can obtain fine and close fully iron base metal ceramics.The degree that sintering metal is hard reaches HRC67, the about 900MPa of three-point bending strength, and Young's modulus is 250GPa, density is about 5.67g/cm ³, fracture toughness property is 7.5MPa.m ^-1/2About.The composition of iron-based bonding phase is in this example: the about 78wt% of Fe content, Mo content are 2wt%, and Ni content is 8.9wt%, and Cr content is 10wt%, and Si content is 2wt%.The TiC ceramic phase is 50wt%.

Embodiment two: the prescription of iron base metal ceramics: 400 purpose TiN powder are 5wt%, and the Ti powder is 57wt%, and the Fe powder is 17wt%, and the Mo powder is 1.25wt%, and the Ni powder is 2wt%, and the Mn powder is 2wt%, and the Cr powder is 1.75wt%, and carbon black is 14wt%.The granularity of above metal powder is 200 orders.The powder for preparing after mixing, the blank that at first downtrodden 10 x, 10 x 2 centimetres; Then blank is put into mould; Then, vacuumize; Energising is ignited then, and after 100 seconds, the pressurization densification just can obtain fine and close fully iron base metal ceramics.The degree that iron base metal ceramics is hard reaches HRC74, and three-point bending strength reaches 800MPa, and Young's modulus is 300GPa, and density is about 5.5g/cm ³, fracture toughness property is 6.1MPa.m ^-1/2About.The composition of iron-based bonding phase is in this example: Fe content is 72wt%, and Mo content is 5wt%, and Ni content is 8wt%, and Mn content is 8wt%, and Cr content is 7wt%, and Ti content is 4wt%.TiC and TiN ceramic phase content are 75wt%.

Embodiment three: the preparation technology of iron base metal ceramics adopts combustion synthesis process, and TiC ceramic phase utilization burning synthetic mode generates, and the middle mutually iron component of iron-based bonding adopts 304 stainless steels.The concrete prescription as follows: 400 purpose TiN powder 5wt%, carbon black is 11wt%, and the Ti powder is 45wt%, and the Mo powder is 1wt%, and 304 Stainless Steel Powders are 36wt%, and the Cr powder is 1.5wt%, and Si is 0.5wt%.The granularity of above metal powder is 200 orders.The powder for preparing after mixing, the blank that at first downtrodden 10 x, 10 x 2 centimetres; Then blank is put into vacuum mold; Then, vacuumize; Follow the blank that ignites of switching on, trigger combustion synthesis reaction, after 100 seconds, the pressurization densification just can obtain the sintering metal of densification fully.The degree that sintering metal is hard reaches HRC72, and three-point bending strength reaches 900MPa, and Young's modulus is 290GPa, and density is about 5.61g/cm ³, fracture toughness property is 6.5MPa.m ^-1/2About.The iron base metal ceramics composition that this routine actual fabrication goes out should be that TiC and TiN ceramic phase are 60wt%; The iron-based bonding is 40wt% mutually; Wherein the composition of iron-based bonding phase is roughly: Fe is 67wt%, and Mo is 2.5wt%, and Ni is 7.25wt%; Cr is 21.5wt%, and Si is that 1.25wt% and Ti are 2.5wt%.

Claims

1. the burning synthesis for preparing Preparation Method of the iron base metal ceramics material of a high TiC content; It is characterized in that: the prescription of said iron base metal ceramics material is: the composition prescription of iron base metal ceramics is: TiC is 45wt%-80wt%, and the content of iron-based bonding phase is at 20wt%-55wt%; Wherein the best composition of iron-based bonding phase is: Fe is 65 wt%-80wt%, and Mo is 1 wt%-5wt%, and Ni is 2 wt%-10wt%; Mn is 0wt%-10wt%; Cr is 10 wt%-22wt%, and Ti is 0 wt%-2.5wt%, and Si is 0 wt%-2.5wt%; With the above iron base metal ceramics powder for preparing evenly after, be pressed into the blank of 2 centimetres of 10 x, 10 x; Then blank is put into mould, vacuumize; Energising is ignited then, and after 100 seconds, the pressurization densification just can obtain fine and close fully iron base metal ceramics.

2. the burning synthesis for preparing Preparation Method of the iron base metal ceramics material of high TiC content according to claim 1 is characterized in that: the iron of iron-based bonding phase can substitute with Stainless Steel Powder and add.

3. the burning synthesis for preparing Preparation Method of the iron base metal ceramics material of high TiC content according to claim 1; It is characterized in that: in the composition prescription of said iron base metal ceramics; The available TiN of the part of TiC replaces, and the replacement amount of TiN is no more than the 5wt% of TiC.