CN105755304A - Preparation method for AlMgB14 superhard ceramic powder material - Google Patents

Abstract

The invention discloses a preparation method for an AlMgB14 superhard ceramic powder material. The preparation method comprises the following steps: weighing magnesium powder, aluminum powder and boron powder according to a mass ratio of 1: 1.0-1.2: 6.23; carrying out uniform mixing through mechanical ball milling and filling a graphite tank with the obtained mixture; placing the graphite tank in a vacuum hot-pressing sintering furnace for reaction sintering; and then carrying out natural cooling. The method has the advantages of usage of simple equipment, simple process, low cost, capacity of realizing batch production, high purity of the prepared material, etc. The ceramic powder material can be used as a composite material antiwear additive and as a raw material for a lubricating and wear-resistant coating.

Description

A kind of AlMgB14The preparation method of ultra hard ceramic powder body material

Technical field

The present invention relates to a kind of AlMgB₁₄The preparation method of ultra hard ceramic powder body material.

Background technology

AlMgB₁₄Being a kind of novel superslide superhard material, cost is only the 1/10 ~ 1/5 of tradition superhard material diamond and cubic boron nitride, has huge potential Economic Application and is worth.AlMgB₁₄Sill have excellence anti-abrasive wear and erosion property, good chemical inertness and thermostability, during as cutting element or drill bit it can be avoided that and metal reaction, be suitable for processing difficult cutting titanium alloy.On the other hand, it is made into coating and is applied in drill bit and cutting element, the rotor blade of aircraft and water pump blade and microelectromechanical systems parts surface, greatly reduce friction, improve the performance of these instruments and parts, use safety and last a long time.

Ahmed etc. (TribologyInternational, 2009,42:706-713) research finds AlMgB₁₄–70wt%TiB₂Wearing and tearing during tool sharpening Ti-6Al-4V alloy workpiece low, react hardly with workpiece, abrasive wear resistance is excellent.Under equal conditions, compared with WC-Co cutter, abrasion reduces about 10 times.

Higdon etc. (Wear, 2011,271:2111-2115) research shows AlMgB₁₄–TiB₂Nano coating and bearing steel are joined the secondary coefficient of friction when water-ethylene glycol green lubrication agent and are low to moderate 0.02, and can steady in a long-term run.

US Patent No. 2005/0100748 discloses a kind of pulsed laser deposition AlMgB₁₄Superhard super composite lubricating film, for reducing the abrasion of microelectronic component or friction means, film hardness is 45 ~ 51GPa, and coefficient of friction is low to moderate 0.04, is well combined with multiple substrate simultaneously.

Chinese patent CN101786883A discloses a kind of functionally-gradient ceramic knife tool with layer-by-layer nested structure and preparation method thereof.This cutter includes the AlMgB of at least three layers different ratio₁₄-TiB₂Complex, each layer complex is successively distributed from inside to outside, by core layer to top layer AlMgB₁₄Content is gradually increased.The sintex life-span prepared by the present invention improves 20 ~ 30% than traditional structure graded ceramics cutter.

US Patent No. 2005/0279185 discloses a kind of superhard boride (AlMgB for Reinforcements for Metal Matrix Composites₁₄).

But, restrict AlMgB at present₁₄It is AlMgB that sill strengthens a key issue of application in phase in coating and composite₁₄Powder is susceptible to oxidation in preparation process and generates spinelle, and material purity is low, finally affects the physicochemical property of composite and coating material.The present invention utilizes vacuum reaction sintering technology to be prepared for highly purified AlMgB₁₄Powder body material, prepared powder can be used for composite additives and high rigidity anti-wear lubricating coating material.

Summary of the invention

It is an object of the invention to provide a kind of low cost, scale can prepare high-purity AlMgB₁₄The method of ultra hard ceramic powder body material.

For solving the problems referred to above, AlMgB of the present invention₁₄The preparation method of ultra hard ceramic powder body material: 1:1.0 ~ 1.2:6.23 weighs magnesium powder, aluminium powder and boron powder in mass ratio, ball mill mixes 2 ~ 5 hours with the speed of 250 ~ 350r/min, ratio of grinding media to material is 2:1, mixed for ball milling reactant feed is put into graphite tank, is subsequently placed in vacuum sintering funace and heats, 15 ~ 20 DEG C/min of heating rate, it is filled with high-purity argon gas when 400 ~ 500 DEG C, when temperature reaches 1300 ~ 1400 DEG C, it is incubated 30 ~ 60 minutes, then natural cooling.

Method of X-ray diffraction is adopted to analyze AlMgB₁₄The purity of powder body material, AlMgB₁₄Phase mass fraction is 96 ~ 98%.

The present invention compared with prior art has the advantage that

(1) material purity prepared by the present invention is higher.

(2) preparation technology of the present invention is simple, cost is low, can be mass.

AlMgB₁₄The parts such as drill bit made by based composites and coating, instrument, water pump blade, aircraft rotary wing blade have broad application prospects at industrial circle.As the raw material of these materials, AlMgB₁₄Powder body material has important economic worth.

Accompanying drawing explanation

Fig. 1 is AlMgB prepared by the present invention₁₄The XRD spectra of powder body material.

Detailed description of the invention

Embodiment 1

1:1.0:6.23 weighs magnesium powder, aluminium powder and boron powder in mass ratio, ball mill mixes 3 hours with the speed of 300r/min, ratio of grinding media to material is 2:1, mixed for ball milling reactant feed is put into graphite tank, is subsequently placed in vacuum sintering funace and heats, 15 DEG C/min of heating rate, it is filled with high-purity argon gas when 500 DEG C, when temperature reaches 1300 DEG C, it is incubated 60 minutes, then natural cooling.

Embodiment 2

1:1.1:6.23 weighs magnesium powder, aluminium powder and boron powder in mass ratio, ball mill mixes 5 hours with 300r/min speed, ratio of grinding media to material is 2:1, mixed for ball milling reactant feed is put into graphite tank, is subsequently placed in vacuum sintering funace and heats, 20 DEG C/min of heating rate, it is filled with high-purity argon gas when 450 DEG C, when temperature reaches 1350 DEG C, it is incubated 60 minutes, then natural cooling.

Embodiment 3

1:1.2:6.23 weighs magnesium powder, aluminium powder and boron powder in mass ratio, ball mill mixes 5 hours with the speed of 250r/min, ratio of grinding media to material is 2:1, mixed for ball milling reactant feed is put into graphite tank, is subsequently placed in vacuum sintering funace and heats, 20 DEG C/min of heating rate, it is filled with high-purity argon gas when 400 DEG C, when temperature reaches 1400 DEG C, it is incubated 30 minutes, then natural cooling.

Claims (3)

1. an AlMgB₁₄The preparation method of ultra hard ceramic powder body material, it is characterized in that this preparation method is: 1:1.0 ~ 1.2:6.23 weighs magnesium powder, aluminium powder and boron powder in mass ratio, mixed material is loaded in graphite tank after mechanical ball milling mix homogeneously, then graphite tank is placed in vacuum sintering funace and reacts sintering, then natural cooling.

2. the method for claim 1, it is characterised in that described mechanical ball milling mixing condition is: rotating speed 250 ~ 350r/min, ratio of grinding media to material 2:1, time 2 ~ 5h.

3. the method for claim 1, it is characterised in that described sintering parameter is: under high-purity argon gas is protected, 15 ~ 20 DEG C/min of heating rate, sintering temperature 1300 ~ 1400 DEG C, temperature retention time 30 ~ 60min.