CN100360467C

CN100360467C - Iron carbon molybdenum boron zirconia ceramet material and its preparation process

Info

Publication number: CN100360467C
Application number: CNB2005100443617A
Authority: CN
Inventors: 常春
Original assignee: Shandong University
Current assignee: Shandong University
Priority date: 2005-08-02
Filing date: 2005-08-02
Publication date: 2008-01-09
Anticipated expiration: 2025-08-02
Also published as: CN1736946A

Abstract

The present invention discloses metal ceramic materials of iron, molybdenum, carbon, boron and zirconium dioxide series and a preparing method, which belongs to the technical field of metal composite materials. The metal ceramic materials are prepared from the components of the percentage by weight: 20 to 82% of ZrO2, 9 to 40% of Fe, 9 to 40% of Mo, 0.3 to 1% of C, 0.2 to 3% of Al, 0.4 to 10% of B. In the preparing method, iron powder, molybdenum powder, carbon powder, boron powder and zirconium dioxide powder are mixed, ball milling is carried out for the mixed powder by a ball mill, and the powder is pulverized until the particle diameter is less than 05 mu m; blanks are pressed by a mould, and are sintered and formed; the blanks are sintered under a nonoxidation condition, sintered bodies are heated and quickly cooled to obtain the metal ceramic materials. The metal ceramics prepared by the present invention are mainly used for wear and impact resistant members under a corrosion condition, and are especially suitable for casings and impellers of mud pumps, angle heads of middle and high pressure pipe passages in chemical devices, and wear resistant members of oceanic machines under a corrosion environment. The metal ceramic materials have the advantages of high impact toughness, high hardness, favorable abrasive resistance, etc.

Description

A kind of iron, carbon, molybdenum, boron, aluminium, zirconium dioxide cermet material and preparation method thereof

One, technical field

The invention belongs to the cermet material field, particularly relate to a kind of iron content, carbon, molybdenum, boron, aluminium, zirconic cermet material and preparation method thereof.

Two, background technology

Zirconia ceramic has high hardness and wear resistance, but toughness is relatively poor, is easy to fragmentation when being hit.Adopt the zirconium dioxide of toughening technology, toughness is improved, but with respect to metallic substance, its toughness index also differs greatly.United States Patent (USP) 20030167969 discloses the sintering metal of a kind of multivariant oxide ceramics and metallic combination, and the excellent toughness of metal component can be arranged, and the high rigidity and the high-wearing feature of stupalith can be arranged again.But it is different that multivariant oxide requires sintering temperature separately, brings difficulty to sintering process.Chinese patent 92114875.5 discloses a kind of from spreading the agglomerating sintering metal, awaits improving raising but adopt from spreading the agglomerating Technology.

Three, summary of the invention

In order to overcome the low shortcoming of zirconia ceramic impact toughness, the shortcoming that the hardness of iron and molybdenum alloy and wear resistance are not high enough the invention provides cermet material of a kind of iron, carbon, molybdenum, boron, aluminium, zirconium white system and preparation method thereof.

The present invention utilizes iron, carbon, molybdenum, boron, aluminium element reacting to each other in sintering, forms the compound and the sosoloid of iron, carbon, molybdenum, boron, aluminium.Can obtain to be higher than the hardness of common metal material, and fragility is far below stupalith.Utilize the phase transformation characteristics of metal solid solution, can improve mechanical property by thermal treatment.With the compound and the ceramic combination of iron, carbon, molybdenum, boron, aluminium,, can obtain impact toughness height, hardness height and the good sintering metal of wear resistance through rational heat treatment.The technical solution adopted in the present invention is: the characteristic that iron, carbon, molybdenum, boron alloy had is combined with the characteristic of zirconia ceramic, and both learn from other's strong points to offset one's weaknesses mutually, can obtain that impact toughness is higher, hardness is higher, wear resistance preferred metal pottery.By the solubleness of thermal treatment change sosoloid, improve the hardness and the wear resistance of alloy thing phase.Aluminium and boron have short burning effect simultaneously.Adopt the powder stock of iron, carbon, molybdenum, boron, aluminium, zirconium dioxide, mix by a certain percentage,, then sintered compact is heat-treated by ball milling, pressed compact and thermal sintering to powder.Concrete preparation method is as follows:

(1) batching and mix

Commercially pure iron, carbon, molybdenum, boron, aluminium, Zirconium dioxide powder raw material are mixed by a certain percentage, and the concrete weight percent ratio range of raw material powder is as follows:

ZrO ₂ 20～70％

Fe 9～40％

Mo 9～40％

C 0.3～1％

Al 0.2～3％

B 0.4～10％

In the prescription with ZrO ₂35～50%; Fe 15～35%; Mo 13～33%; C 0.4～0.8%; Al 0.3～1.8%; Mechanical property the best of B 3～7% o'clock.

Aluminium in the above-mentioned prescription, boron are sintering agent and effect with the aspects such as grain growth of drawing up; The adding of molybdenum can obviously improve the material impact toughness; Iron can form sosoloid and alloy cpd with other element that adds, and helps the raising of intensity and impact toughness index; Zirconium dioxide can improve the hardness and the wear resistance of material.

(2) powder process

The mill jar of mixed powder being put into ball mill carries out ball milling.The ball milling time is different and different according to the granularity of starting powder, generally at 0.5～5 hour.The granularity of powder can be used after less than 0.5 μ m.

(3) pressed compact

The powder that mill is good adds 5% animal gelatine as interim forming agent, makes pressed compact by mold pressing.

(4) thermal sintering

Pressed compact is heated to 1500～2000 ℃ of scopes carries out sintering, the soaking time during sintering is relevant with the size of pressed compact size, and general insulation is 0.5～5 hour.Cool off with the stove cooling behind the sintering.

(5) burn postheat treatment

Need behind the thermal sintering sintered compact heat-treated and improve mechanical property.Sintered compact is heated to 800～1000 ℃, is incubated 2～3 hours, then sintered compact is put into cooling fluid and cooled off fast, be chilled to room temperature and get final product.

Outstanding effect of the present invention is: iron, molybdenum, carbon, boron, aluminium, the ceramic-metallic hardness of zirconium dioxide and wear resistance is higher than iron, molybdenum is an alloy, impact toughness is higher than zirconia ceramic.After thermal treatment, wherein the hardness of sosoloid and wear resistance are improved in the metallographic phase.The distribution of zirconium dioxide phase is comparatively even, makes material have high antiwear property, and existence has mutually improved the toughness of material to iron with molybdenum.Aluminium and boron have promoted sintering, have reduced sintering temperature.

Sintering metal of the present invention is mainly used in the wear-resisting and shock resistance member under the etching condition, for example the elbow of the housing of slush pump and impeller, chemical industry equipment mesohigh pipeline, the wear member of ocean machinery etc. under the corrosive environment.

Four, embodiment

Embodiment 1

Commercially pure iron, molybdenum, carbon, boron, aluminium, Zirconium dioxide powder raw material are carried out proportioning and mixing, and concrete weight percent proportioning is as follows:

ZrO ₂ 70％

Fe 13％

Mo 11％

C 0.4％

Al 0.6％

B 5％

Utilize the pendulum-type ball mill that above-mentioned powder is carried out ball milling.Powder particle size less than 0.5 μ m after, add 5% animal gelatine, become pressed compact by mold pressing.Pressed compact is put into sintering oven be heated to 1950 ℃, be incubated 0.5 hour, come out of the stove after being chilled to room temperature with stove.Sintered compact is heated to 900 ℃ again, is incubated 2.5 hours, in cooling fluid, cool off fast then.Get final product behind the cool to room temperature.

Embodiment 2

Powder stock carries out proportioning and mixing with embodiment 1, and concrete weight percent proportioning is as follows:

ZrO ₂ 20％

Fe 40％

Mo 30％

C 0.5％

Al 0.5％

B 9％

All the other processes are identical with embodiment 1, and difference is that sintering temperature is 1550 ℃, is incubated 4 hours.

Embodiment 3

The same routine embodiment 1 of powder stock carries out proportioning and mixing, and concrete weight percent proportioning is as follows:

ZrO ₂ 50％

Fe 24％

Mo 20％

C 0.7％

Al 0.3％

B 5％

All the other processes are identical with embodiment 1, and difference is that sintering temperature is 1650 ℃, is incubated 2 hours.

Claims

1. the cermet material of an iron content, molybdenum, carbon, boron, aluminium, zirconium dioxide is characterized by this ceramic-metallic weight percent proportioning and is: ZrO ₂20～70%; Fe 9～40%; Mo 9～40%; C 0.3～1%; Al 0.2～3%; B 0.4～10%.

2. the preparation method of the cermet material of an iron content, molybdenum, carbon, boron, aluminium, zirconium dioxide is characterized in that this preparation method's step is:

(1) batching and mix: adopt commercially pure iron, molybdenum, carbon, boron, aluminium, Zirconium dioxide powder raw material, press ZrO ₂20～70%; Fe 9～40%; Mo 9～40%; C 0.3～1%; Al 0.2～3%; B 0.4～10% proportioning is mixed;

(2) powder process: utilize ball mill that the powder for preparing is carried out ball milling, ball milling 0.5～5 hour, the powder particles behind the ball milling＜0.5 μ m;

(3) pressed compact: utilize the mould extrusion forming;

(4) thermal sintering: sintering temperature is 1500～2000 ℃, soaking time 0.5～5 hour;

(5) burn postheat treatment: be heated to 800～1000 ℃, be incubated 2～3 hours, the cooling fast of insulation back.