CN103231054B

CN103231054B - Sintering-brazing method of metal matrix diamond segments

Info

Publication number: CN103231054B
Application number: CN201310154970.2A
Authority: CN
Inventors: 卢金斌; 张文勇; 王志新; 张旺玺; 神会存
Original assignee: Zhongyuan University of Technology
Current assignee: Zhongyuan University of Technology
Priority date: 2013-04-28
Filing date: 2013-04-28
Publication date: 2015-04-29
Anticipated expiration: 2033-04-28
Also published as: CN103231054A

Abstract

A sintering-brazing method of metal matrix diamond segments comprises cleaning a diamond and pre-coating a layer of Ni-Cr-Cu-B-Si alloyed powder through organic gelatin; mixing Fe matrix pre-alloyed power and the diamond coated with the Ni-Cr-Cu-B-Si alloyed powder according to a weight ratio of 15-20:1 and cold compressing the Fe matrix pre-alloyed power and the diamond coated with the Ni-Cr-Cu-B-Si alloyed powder to be segments; and performing vacuum high temperature sintering on the segments in a 900 to 920 DEG C condition and forming into carbide with the reaction of the Ni-Cr-Cu-B-Si alloyed powder and the diamond in a vacuum and high temperature condition to improve the control capability of the Fe matrix pre-alloyed powder to the diamond. The sintering-brazing diamond segments have the advantages of having characters of chemical metallurgical bonding of the brazing and advantages of sintered multi-layer, so that tools which are produced with the segments have the advantages of being long in service life and high in sharpness.

Description

A kind of sintering-soldering makes the method for metal-base diamond joint block

Technical field

The invention belongs to super hard abrasive tool making field, mainly for the manufacturing technology of metal-base diamond joint block.

Background technology

The excellent specific properties such as it is high that high temperature brazing mono-layer diamond tool has bond strength, is conducive to environmental protection, and abrasive material exposure is high, and abrasive material effective rate of utilization is high, and the life-span is long, have a wide range of applications.

Ni-Cr-B-Si solder has the features such as excellent to diamond wetability, wearability is good, is the most widely used solder of current brazed diamond tool.Adopt Ni-Cr-B-Si solder can form carbide on adamantine surface to diamond brazing, improve the bonding strength of diamond and solder, therefore be usually used in manufacturing single layer soldering diamond tool, such instrument has that exposure is high, abrasive material holds intensity advantages of higher.But this solder was originally for welding the high-strength materials such as high temperature alloy, therefore there is the feature that wearability, hardness, intensity are all higher, and in use diamond tool needs articulamentum and the wearing and tearing of solder layer appropriateness to make the in good time exposure of diamond abrasive, therefore Ni-Cr alloy is for welding diamond abrasive, and its hardness, intensity are a bit higher.The present invention, by adding a certain amount of Cu element in Ni-Cr-B-Si alloy, namely forms Ni-Cr-Cu-B-Si alloyed powder, mainly based on following several respects: 1, Cu and Ni can infinitely dissolve each other; 2, the fusing point of simple substance Cu, intensity, hardness are all lower than simple substance Ni.3, Cu element is not catalyst to diamond, and Ni element is catalyst, and Cu element can not have fire damage to diamond.

Soldering mono-layer diamond tool owing to only having individual layer abrasive material, and adopts Ni-Cr alloy to carry out the manufacture of brazed multilayer diamond tool, the shortcoming that abrasive material is difficult to exposure can occur, be therefore restricted.

Sintering type metal bonding agent instrument mainly with bronze, iron-based, the metal such as Ni-based as bonding agent, manufacture with high-temperature sintering process, good moldability, high temperature resistant, thermal conductivity wearability is good, long service life, can bear larger load, but come off because diamond abrasive holds intensity low often causing in use procedure, diamond abrasive utilization rate is declined.Can find out, sintering, method for welding manufacture diamond tool respectively certain advantage.

Summary of the invention

Technical problem to be solved by this invention is for the deficiency in soldering mono-layer diamond tool and sintering instrument background technology, provides a kind of sintering-soldering to make the method for metal-base diamond joint block.

In order to solve the problem by the following technical solutions: a kind of sintering-soldering makes the method for metal-base diamond joint block, and concrete preparation method is as follows:

(1) first diamond is cleaned, adopt organic gel precoating layer Ni-Cr-Cu-B-Si alloyed powder;

(2) Fe base prealloy powder mixes according to weight ratio 15 ~ 20:1 with the diamond being coated with Ni-Cr-Cu-B-Si alloyed powder, and carries out colding pressing for joint block;

(3) will save block and carry out vacuum high-temperature sintering at 900 DEG C ~ 920 DEG C, in vacuum high-temperature, Ni-Cr-Cu-B-Si alloyed powder and diamond react and form carbide, improve Fe base prealloy powder to adamantine hold.

Described Ni-Cr-Cu-B-Si alloyed powder, wherein C is (wt%) 0.6 ~ 1.2, Cr be (wt%) 12 ~ 15, Cu be (wt%) 6 ~ 15, B is (wt%) 2.5 ~ 4.5, Si(wt%) 3 ~ 4.5, Ni be surplus.

Sintering of the present invention-braze welding diamond joint block, the enhanced primary treatment feature of existing soldering, possesses again the advantage of sintered multilayer, and the instrument therefore adopting such joint block to prepare has the advantage that the life-span is long, sharpness is high.

Detailed description of the invention

Embodiment 1: a kind of sintering-soldering makes the method for metal-base diamond joint block, preparation method is as follows: (1) raw-material preparation: 35-40 order diamond, Fe base prealloy powder, wherein diamond: Fe base prealloy powder weight is 1:18.

(2) acetone is adopted to carry out Ultrasonic Cleaning to diamond, organic gel is coated in diamond surface in advance, attach layer of Ni-Cr-Cu-B-Si alloyed powder, it is (wt%) 1 that its chemistry becomes C, Cr is (wt%) 12, Cu be (wt%) 10, B is (wt%) 3, Si(wt%) 3, surplus is Ni.

(3) diamond of coated alloy powder, Fe base prealloy powder are mixed, adopt cold press to carry out colding pressing for required joint block, pressure is 120MPa.

(4) the joint block of precompressed is carried out vacuum high-temperature sintering at 920 DEG C, vacuum is higher than 10 ^-2pa, insulation 10min, forms carbide by Cr and diamond in the Ni-Cr-Cu-B-Si alloyed powder of diamond surface at vacuum reaction, improves Fe base prealloy powder to adamantine hold.

Embodiment 2: a kind of sintering-braze welding diamond joint block, preparation method is as follows: (1) raw-material preparation, 40-45 order diamond, Fe base prealloy powder, wherein diamond: Fe base prealloy powder weight is 1:20.

(2) acetone is adopted to carry out Ultrasonic Cleaning to diamond, organic gel is coated in diamond surface in advance, attach layer of Ni-Cr-Cu-B-Si alloyed powder, it is (wt%) 1.2 that its chemistry becomes C, Cr is (wt%) 12, Cu be (wt%) 10, B is (wt%) 3.5, Si(wt%) 3.5, surplus is Ni.

(3) diamond scribbling alloyed powder is in advance mixed with Fe base prealloy powder, adopt cold press to carry out being cold-pressed into required joint block size.

(4) joint block is carried out vacuum high-temperature sintering at 920 DEG C, temperature retention time 15min, vacuum is higher than 10 ^-2pa, be that solid liquid phase coexists at temperature retention time Ni-Cr-Cu-B-Si, Cr element wherein and diamond form carbide Cr at vacuum reaction ₃c ₂, obtain carbide by interface and significantly improve Fe base prealloy powder to adamantine hold.

Embodiment 3: a kind of sintering-method for welding makes metal-base diamond joint block, and preparation method is as follows: (1) raw-material preparation, 35-40 order diamond, Fe base prealloy powder, wherein diamond: Fe base prealloy powder weight is 1:15.

(2) adopt acetone to carry out Ultrasonic Cleaning to diamond, organic gel is coated in diamond surface in advance, attaches layer of Ni-Cr-Cu-B-Si alloyed powder, it is (wt%) 9 that its chemistry becomes C for (wt%) 1.2, Cr is (wt%) 14, Cu, B is (wt%) 4, Si(wt%) 4.5, surplus is Ni.

(3) mixed with Fe base prealloy powder by the diamond scribbling alloyed powder in advance, adopt cold press to cold pressing in a mold, pressure is 150MPa, makes joint block blank.

(4) will save block blank and carry out vacuum high-temperature sintering at 900 DEG C ~ 920 DEG C, vacuum is higher than 10 ^-2pa, insulation 25min, forms carbide by Cr and diamond in the Ni-Cr-Cu-B-Si alloyed powder of diamond surface at vacuum reaction, improves Fe base prealloy powder to adamantine hold.

Claims

1. sintering-soldering makes a method for metal-base diamond joint block, it is characterized in that preparation method is as follows:

(2) Fe base prealloy powder mixes according to weight ratio 15 ~ 20:1 with the diamond being coated with Ni-Cr-Cu-B-Si alloyed powder, and carries out colding pressing for joint block; Described Ni-Cr-Cu-B-Si alloyed powder, its chemical composition is: C 0.6 ~ 1.2 wt%, Cr 12 ~ 15 wt%, Cu 6 ~ 15 wt%, B 2.5 ~ 4.5wt%, Si 3 ~ 4.5 wt%, and Ni is surplus;