CN1116143A

CN1116143A - Composite material containing diamond

Info

Publication number: CN1116143A
Application number: CN 95105922
Authority: CN
Inventors: 孙友宏; 张祖培
Original assignee: CHANGCHUN GEOLOGIC COLLEGE
Current assignee: CHANGCHUN GEOLOGIC COLLEGE
Priority date: 1995-05-31
Filing date: 1995-05-31
Publication date: 1996-02-07
Anticipated expiration: 2015-05-31
Also published as: CN1060417C

Abstract

Said material consists of protective layer, transition layer, adhesive layer and bottom lining. The wearability is 1000 times as much as that of ordinary hard metalss; the hardness number is HRA 87-90; impact toughness reaches 33.3 J per cm edge-length; thermal stability reaches 800 deg.C. Said material can be used in percussion drill and quarrying.

Description

Contain diamond composite

The present invention relates to a kind of diamond composite that contains that is used for percussive drilling and drilling tool, also can expand the cutting tool that is used for mechanical processing industry.

At present, casting tooth that percussive drilling is used and drilling tool bore bit, mainly be to adopt Hardmetal materials, though this material has certain wearability and enough toughness, but it is unable to do what one wishes just to seem in competent bed, service life is short. in the diamond compact of U.S. No.3745623 patent disclosure, let it be to the greatest extent, and toughness improves a lot than dimond synneusis, but can not be used for impact drilling, can only be used for turning round detritus. a kind of dimond synneusis composite sheet manufacture method that is used for rock bit of U.S. No.4604106 patent disclosure, adopted compound transitional technology, between the work top layer dimond synneusis of diamond compact and end liner, increase one or several transition zone of forming by diamond and carbide alloy fragment, thereby can solve because of the dimond synneusis layer is different with the end liner thermal coefficient of expansion causes two interlayers in the difficult problem of cooling back delamination again of being heated, but there is following shortcoming, the one, work layer on surface is a dimond synneusis, its figuring of surface is extremely difficult, the 2nd, often all be to grind away because of the drill steel body to scrap because of the dimond synneusis layer is extremely wear-resisting, the 3rd, sintering process complexity and cost height.

Purpose of the present invention just is to provide a kind of diamond composite that contains that is used for percussive drilling and drilling tool, realizes easily processing, and wearability and impact flexibility are complementary, shock resistance, and cost is low, and the life-span is long, rock drilling timeliness height in competent bed.

Technical scheme of the present invention comprises working lining, and transition zone and end liner is characterized in that:

(1) containing the diamond composite front end is the protection machined layer, and there is adhesive linkage the centre;

(2) thickness of protection machined layer is 0.2mm-0.3mm, and its composition is to be that the tungsten carbide of 85-92% adds the cobalt that content is 8-15% by content;

(3) thickness of adhesive linkage is 1mm-2mm, and its composition is to be that the tungsten carbide of 85-90% adds the cobalt that content is 15-10% by content;

(4) thickness of working lining is 1mm-3mm, and its composition is that to add content be that 13% cobalt is formed for tungsten carbide that the diamond of 7-50% adds 80-27% by content.

The present invention also can realize by following measure, after layers of material is mixed by percentage composition,, vacuumized or filling H to the layer 5 roof pressure moulding in the mould of packing into successively by ground floor ₂Or N ₂Sintering under the gas shield environment also can add under the graphite cannula solid protection environment at pyrophillite and carry out sintering, and its sintering temperature is 1200-1500 ℃, and pressure is 1000-6000kg/cm ²Sintering time is 2-15 minute.

Accompanying drawing 1 is to contain the diamond composite side cutaway view.

Described in detail below in conjunction with accompanying drawing:

The protection machined layer; be outermost layer; mainly be to be used to protect working lining 2 and to add easy reconditioning profile in man-hour; its optimum thickness is 0.25mm; its composition is that 92% tungsten carbide adds 8% cobalt; this one deck grinds off in drilling process very soon; carry out fractured rock by working lining 2; the thickness of the best of working lining 2 is 3mm; its composition is to be that 31% diamond adds 50% tungsten carbide to add content be 13% cobalt by content; perhaps content is that 13% diamond adds 74% tungsten carbide to add content be that 19% cobalt is formed, and the thickness of adhesive linkage 4 is 1.5mm, and its composition is that 85% tungsten carbide adds 15% cobalt and forms by content.After all layer of layers of material mixed by percentage composition; pack into successively in the graphite jig that alcohol was handled to layer 5 by ground floor; roof pressure is shaped; can be in the high-temperature high-pressure apparatus of diamond sintering; can carry out sintering in the conventional hot-press equipment of making diamond tool, diamond does not produce fire damage in sintering process in order to make yet, and must create the sintering environment to the protection of diamond fire damage; can adopt to vacuumize way, or adopt filling H ₂Gas or N ₂Gas is protected the sintering environment; also can add under the graphite cannula solid protection environment at pyrophillite and carry out sintering, common sintering temperature is crossed 1400 ℃, the pressure when determining sintering according to the size of sintered body; in general the sintered body diameter is 2mm, and its sintering pressure is 1000kg/cm ², sintering time generally was controlled at 8 minutes.

Provided by the inventionly be used for percussive drilling and drilling tool contains diamond composite, detect through Ministry of Geology and Mineral Resources diamond composition quality testing center, its wear resistance ratio is 100-1000 a times of conventional tungsten cobalt scleroma alloy, hardness is HRA87-90, toughness reaches every centimetre of long 33.3J of sword, and thermal stability reaches 800 ℃.

Description of drawings:

1--protection machined layer 2--working lining 3--transition zone

4--adhesive linkage 5--end liner

Claims

1. the diamond composite that contains that is used for percussive drilling and drilling tool comprises working lining, and transition zone and end liner is characterized in that:

(2) thickness of protection machined layer is 0.2mm-0.3mm, and its composition is that to add content be that the cobalt of 8-15% is formed for the tungsten carbide of 85-92% by content;

(3) the thickness 1-2mm of adhesive linkage, its composition is made up of for the 15-10% cobalt for the 80-90% tungsten carbide adds content content;

(4) thickness of working lining is 1-3mm, and its composition is that tungsten carbide that the diamond of 13-50% adds 74-37% adds content and forms for the 13-20% cobalt by content;

2. according to the described diamond composite that contains of claim 1, after it is characterized in that layers of material mixed by weight percentage, pack mould successively into to layer 5 by first, roof pressure is shaped.

3. according to the described diamond composite that contains of claim 1, it is characterized in that sintering condition is vacuumizing or filling H ₂Or N ₂Sintering under the gas shield environment also can add under the graphite cannula solid protection environment at pyrophillite and carry out sintering.

4. according to the described diamond composite that contains of claim 1, it is characterized in that sintering temperature is 1200-1500 ℃, pressure is 1000-6000Kg/cm ², sintering time 2-15 minute.