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Nickel-boron-coated calcium fluoride composite powder, its preparation and application and self-lubricating ceramic tool

A composite powder, calcium fluoride-coated technology, applied in the directions of lubricating compositions, chemical instruments and methods, base materials, etc., can solve problems such as the decline of mechanical properties of ceramic tools, improve low-strength characteristics, increase speed, and difficulty in operation. low effect

Active Publication Date: 2017-05-03
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] against CaF 2 The addition of solid lubricants leads to the technical problem of the decline in the mechanical properties of ceramic cutting tools. The present invention provides a nickel-boron-coated calcium fluoride composite powder for self-lubricating ceramic cutting tools and its preparation method

Method used

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  • Nickel-boron-coated calcium fluoride composite powder, its preparation and application and self-lubricating ceramic tool
  • Nickel-boron-coated calcium fluoride composite powder, its preparation and application and self-lubricating ceramic tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: CaF 2 activation of

[0047] (1) Take 2.5gSnCl 2 ·H 2 O is placed in a container, add 4 mL of concentrated hydrochloric acid and stir for 5 min, then add distilled water to a total volume of 200 mL to obtain a sensitized solution; take 15 g of CaF 2 And add it to the sensitization solution, ultrasonically stir for 10min, centrifuge and filter 6 times until the solution is neutral, the speed of the centrifuge is 2600r / min; take out the CaF 2 The suspension is ready for use.

[0048] (2) Take 4mL of concentrated hydrochloric acid in a container, add 0.15g of PdCl 2 , then add distilled water to a total volume of 200mL, the CaF after step (1) sensitization 2 The suspension was added to the container and stirred for 10 min until the suspension completely turned brown.

[0049] (3) Centrifuge the activated suspension at a speed of 3000r / min, centrifuge 7 times, take out the precipitate, and carry out vacuum drying at a vacuum drying temperature of 30°C to ob...

Embodiment 2

[0051] (1) Configure nickel-boron electroless plating solution

[0052] Weigh 1.5g of NiSO 4 ·6H 2 O was dissolved in 20 mL of distilled water, 6 mL of ethylenediamine was added to 50 mL of distilled water, and the NiSO 4 ·6H 2 Pour the O solution into the ethylenediamine solution and stir evenly to obtain the A solution;

[0053] Dissolve 4g of NaOH in 20mL of distilled water, add 0.13g of sodium borohydride, and stir evenly to obtain liquid B;

[0054] Add liquid B to liquid A, and stir evenly; add 0.2 mg of thiourea, stir for about 1 min, add distilled water to make up to a total volume of 100 mL, and the plating solution configuration is completed.

[0055] (2) Take 0.5g CaF that has been activated with a particle size of about 3 μm 2 Add 10mL of distilled water, stir to form a suspension, keep the plating solution prepared in step (1) at about 65°C, and place it in an ultrasonic environment. 2 The suspension was poured into the plating solution for plating. During t...

Embodiment 3

[0059] (1) Weigh 1.0g of NiSO 4 ·6H 2 O and dissolve it in 20ml of distilled water, take 5mL of ethylenediamine and add to 50mL of distilled water, NiSO 4 ·6H 2 Pour O solution into ethylenediamine and stir evenly to obtain liquid A; take 4g NaOH and dissolve it in 30ml of distilled water, add 0.15g sodium borohydride and stir evenly to obtain liquid B; add liquid B to liquid A Add 0.1 mg of thiourea to the mixed solution of A and B solutions and stir slowly, and the plating solution configuration is completed.

[0060] (2) Adjust the temperature of the plating solution to about 55°C, and take the activated CaF with a particle size of about 5 μm 2 0.5g, pour it into 10ml of distilled water, stir to form a suspension, place the plating solution in an ultrasonic environment, and 2 The suspension was poured into the plating solution for ultrasonic electroless plating, and the stirring speed was set to 60r / min, and the plating was terminated when no bubbles emerged.

[0061] ...

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Abstract

The invention relates to nickel-boron-coating calcium fluoride composite powder, a preparation method and an application thereof and a self-lubricating ceramic cutter. The nickel-boron-coating calcium fluoride composite powder has a CaF2@Ni-B core-shell structure and adopts an ultrasonic assistant chemical plating method: adding the activated CaF2 powder suspension liquid into a nickel-boron chemical plating solution, and precipitating nickel and boron and covering the surface of micrometer CaF2 with nickel and boron under the ultrasonic and stirring condition; the nickel-boron chemical plating solution contains 15g / L to 20g / L of nickel sulfate, 50 to 60 mL / L of ethylenediamine, 1 to 1.5 g / L of sodium borohydride and 30 to 50 g / L of sodium hydroxide. The invention also provides a preparation method and an application of the nickel-boron-coating calcium fluoride composite powder. The nickel-boron-coating calcium fluoride composite powder is charged into a self-lubricating ceramic cutter base body, so that the fracture flexibility and bend-resisting strength of the ceramic cutter can be remarkably improved.

Description

technical field [0001] The invention relates to a nickel-boron-coated calcium fluoride composite powder and a preparation method and application thereof, belonging to the technical field of ceramic tool materials. Background technique [0002] Calcium Fluoride (CaF 2 ) as a solid lubricant occupies a very important position in the development of ceramic cutting tools. It is resistant to high temperature, chemical corrosion, and has excellent lubricating effect at medium and high temperatures. The self-lubricating ceramic cutting tool obtained by introducing calcium fluoride into the field of ceramic cutting tools can avoid the use of lubricating fluid and realize dry friction, which not only protects the environment, but also improves economic benefits. Since the self-lubricating ceramic cutting tool prepared by adding calcium fluoride into the ceramic cutting tool has long been precedent, some shortcomings of calcium fluoride have also been exposed. The addition of calcium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/06C10M103/00C10M103/06C04B35/10C23C18/32C23C18/18
Inventor 许崇海徐龙华肖光春衣明东吴光永
Owner QILU UNIV OF TECH
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