CN1736946A

CN1736946A - Iron carbon molybdenum boron zirconia ceramet material and its preparation process

Info

Publication number: CN1736946A
Application number: CN 200510044361
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: 2006-02-22
Anticipated expiration: 2025-08-02
Also published as: CN100360467C

Abstract

The invention discloses a metal ceramic material belonged to iron, molybdenum, carbon, boron, and zirconium dioxide series. Wherein, the preparation proportion presents: ZrO2 20-82%, Fe 9-40%, Mo 9-40%, C 0.3-1%, Al 0.2-3%, and B 0.4-10%. The opposite preparation technique comprises: taking ball grinding to the powder of said material till the particle diameter is less than 0.5um, compacting blank with mould, sintering without oxygen to form, heating and cooling the sintered body rapidly to obtain the product.

Description

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

Technical field

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

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.

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 a kind of impact toughness is strong, hardness is high and wear resistance is good iron, carbon, molybdenum, boron, zirconic cermet material and preparation method thereof.

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.Adopt the powder stock of iron, carbon, molybdenum, boron, 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 technology is as follows:

(1) batching and mix

Commercially pure iron, carbon, molybdenum, boron, Zirconium dioxide powder raw material are mixed by a certain percentage the concrete ratio range of raw material powder following (weight percent):

ZrO ₂ 20～82％

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%; C0.4～0.8%; Al 0.3～1.8%; Mechanical property the best during B3～7% scope.

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

Under oxygen free condition pressed compact is heated to 1500～2000 ℃ of scopes and 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.Under oxygen free condition, 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.

The present invention utilizes iron, carbon, molybdenum, boron reacting to each other in sintering, forms the compound and the sosoloid of iron, carbon, molybdenum, boron.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,, can obtain impact toughness height, hardness height and the good sintering metal of wear resistance through rational heat treatment.Outstanding effect of the present invention is: iron, molybdenum, carbon, boron, 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.

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:

A kind of iron, carbon, molybdenum, boron, zirconic cermet material and preparation method thereof are as follows:

Commercially pure iron, molybdenum, carbon, boron, Zirconium dioxide powder raw material are carried out proportioning and mixing, concrete proportioning following (weight percent):

ZrO ₂ 70％

Fe 13％

Mo 11％

C 0.4％

Al 0.6％

B 5% utilizes 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 as interim forming agent, 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, concrete proportioning following (weight percent):

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, concrete proportioning following (weight percent):

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 and the preparation technology thereof of an iron content, molybdenum, carbon, boron, zirconium dioxide is characterized by this ceramic-metallic proportioning and are (weight percent): ZrO ₂20～82%; Fe 9～40%; Mo 9～40%; C 0.3～1%; Al 0.2～3%; B 0.4～10%.Its preparation technology is as follows:

(1) batching and mix: adopt commercially pure iron, molybdenum, carbon, boron, Zirconium dioxide powder raw material, mix by proportioning;

(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 mold cold molded;

(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.

2. according to claim 1, the cermet material of iron content, molybdenum, carbon, boron, zirconium dioxide is characterized in that the best ratio range of this cermet material: ZrO ₂35～50%; Fe 15～35%; Mo 13～33%; C 0.4～0.8%; Al 0.3～1.8%; B 3～7%.