CN1260456A - Toughened zirconium oxide ceramic composite steel sleeve - Google Patents

Abstract

The present invention uses ZrO2 as base material and adds Y2O3, MgO and alpha-Al2O3 to the base material adopts the processes of ball grinding, spray prilling, isostatic pressure forming, firing the blank in high-temp. furnace at 1460-1520 deg.C and heat-insulating for 1.5-3 hr, placing the fired blank in melal outer jacket whose internal hole tightness is 0.1-0.4 mm and fully expanded after preheated, and cooling to obtain the invented flexibilized ZrO2 composite cylinder jacket. Said invention is simple in production process, low in sintering temp., can be made into integrated ceramic cylinder jacket, its service life is long, and the service life or rubber piston can be prolonged by above 3 times.

Description

The toughened zirconium oxide ceramic composite cylinder jacket

The invention belongs to pottery.

Existing ceramic cylinder jacket adopts 96%Al ₂O ₃Pottery is made, and its preparation process is: injection forming is 3～6% through once calcining (1450～1500 ℃) to the porosity, after the processing, at 1500～1700 ℃ of final sintering.The resistance to flexure of the stupalith after this technology is made is 300MPa, and be 800～1000 hours working life.The maximum diameter of this ceramic cylinder jacket is 180mm, and maximum height is 280mm.The outstanding shortcoming of this ceramic cylinder jacket production technology is a complex process, need twice firing, the sintering temperature height, made cylinder sleeve maximum height only is 280mm, be used for slurry pump and need splicing, and the mechanical property of material is low, working life low (" long-lived alumina ceramic cylinder liner for large wellpumps by 2-stage baking of cylinderical pot; with intermediate working to sizcrequired, and finally cutting off pot bottom "/EP.162.284.A).

The present invention's toughened zirconium oxide material, (the one ceramic cylinder jacket of φ 170～180 * 400mm), be more than 8 times of bi-metal liner working life, overcomes the problem that existing correlation technique exists to adopt easy technology to prepare large scale.

The prescription of toughened zirconium oxide ceramic material of the present invention is: with ZrO ₂Be base, add 2～3mol%Y ₂O ₃, 0.5～5mol%MgO, 4.0～15Vol% α-Al ₂O ₃Take by weighing raw material by prescription, press solid content 55～70wt% and add deionized water, adding 0.5～1.5wt% ammonium polyacrylate again is dispersion medium, and material and dispersion medium place pebble mill to mix 14～24 hours, slip is spray-dried, and obtaining particle diameter is the granulation powder of 50～120 μ m.This granulation powder vibra-pack is used in the annular space of mould in the hydrostatic pressing that is made of steel core and gum cover, and capping is placed in the wet type isostatic press, in 220～250MPa forming under the pressure.In the saggar contour of packing into behind the formed body repaired biscuit with it, cylinder sleeve base substrate underlay is material, the blanket that makes with briquetting pressure together, in High Temperature Furnaces, heat up, to 1460～1520 ℃ of insulations 1.5～3 hours, with the speed cooling of maximum rate of cooling ≯ 2 ℃/min with 30～120 ℃ of/hour speed.Cylinder sleeve porcelain base after burning till is carried out the processing of outer garden, press garden in magnitude of interference 0.1～0.4mm processing metal overcoat.With the metal-coating that processes be preheated to 200～450 ℃ and make it fully to expand after, the ceramic cylinder jacket that will process outer garden is put into metal-coating rapidly, after the cooling, the toughened zirconium oxide ceramic composite cylinder jacket of φ 170～180 * 400mm is made in fine gtinding processing ceramic Nei Yuan hole.

The outstanding advantage of toughened zirconium oxide composite cylinder jacket of the present invention is that to compare sintering temperature low with common toughened zirconium oxide ceramic, preparation process is simple, can be made into the ceramic cylinder jacket of large scale one, the long service life of ceramic cylinder jacket, also improve more than 3 times the working life of matching used rubber piston.Compare the life-span prolongation reaches more than 8 times with bi-metal liner.

Embodiment:

By prescription weighing ZrO ₂Powder (Mean particle diameter＜1.0 μ m) 50Kg, Y ₂O ₃(Mean particle diameter＜1.0 μ m) 2.54Kg, MgO (Mean particle diameter＜1.0 μ m) 350g, α-Al ₂O ₃(＜1.0 μ m) 1.8Kg adds entry 36.5Kg by solid content 60wt%, presses 1wt% and adds ammonium polyacrylate 547g, places ball milling to mix 24 hours in above-mentioned material and dispersion medium.The spray-dried granulation powder that makes the about 70 μ m of particle diameter of slip behind the ball milling.This granulation powder vibration is filled in the annular space of gum cover and steel core formation isostatic tooling, capping places the wet type isostatic press in the 240MPa forming under the pressure.The formed body repaired biscuit is placed in the olybdenum silicide bar stove, is warming up to 1490 ℃ with 100 ℃/hour speed, be incubated 3 hours, the highest cooling rate of control is that 2 ℃/min cools off again.The mechanical property of the test piece that makes is: σ is 600MPa, K _1cFor $11\mathrm{MPa}\sqrt{m}$ 。To burn till the porcelain base on outer circular end grinding machine, process outside the garden, press garden in the magnitude of interference 0.4mm processing metal overcoat.The metal-coating that processes is preheated to 450 ℃, is incubated 3 hours, metal-coating is fully expanded, again ceramic cylinder jacket is put into.After the cooling garden in the ceramic cylinder jacket is milled to φ 170+0.05mm, makes the toughened zirconium oxide ceramic composite cylinder jacket of φ 170 * 400mm.This cylinder sleeve uses and still can continue after 2000 hours to use, and the life-span of rubber piston is improved 3 times when using Metallic cylinder.

Claims (3)

1. ceramic cylinder jacket and preparation process thereof the invention is characterized in that the material prescription of ceramic cylinder jacket is: ZrO ₂Be base, add 2～3mol%Y ₂O ₃, 0.5～5.0mol%MgO, 4.0～1 5Vol% α-Al ₂O ₃To add deionized water by solid content 55～70wt% by the raw material of prescription weighing, and to add 0.5～1.5wt% ammonium polyacrylate be dispersing agent, mixed 14～24 hours through ball milling, spray drying is made the granulation powder of particle diameter 50～120 μ m, again this granulation powder is vibrated in the annular space of the isostatic tooling that is filled in steel core and gum cover formation, capping, be placed in the wet type isostatic press, in 220～250MPa forming under the pressure, base substrate behind the repaired biscuit pack into the contour saggar of formed body in, cylinder sleeve base substrate underlay is material and with the blanket of briquetting pressure together, at the high temperature kiln roasting, the cylinder sleeve after burning till is garden and metal-coating assembling outside processing, and makes toughened zirconium oxide ceramic composite cylinder jacket of the present invention.

2. ceramic cylinder jacket according to claim 1 and preparation process thereof is characterized in that the base substrate speed with 30～120 ℃/hour in High Temperature Furnaces behind the repaired biscuit heats up, and to 1460～1520 ℃ of insulations 1.5～3 hours, control maximum rate of cooling ≯ 2 ℃/min.

3. ceramic cylinder jacket according to claim 1 and preparation process thereof, the ceramic cylinder jacket and the metal-coating device that it is characterized in that garden outside processing are by magnitude of interference 0.1～0.4mm processing metal overcoat Nei Yuan hole, then the metal-coating that processes is preheated to 200～450 ℃, be incubated 2.5～3.5 hours, after treating that it fully expands, the ceramic cylinder jacket that will process outer garden is put into rapidly, after the cooling, grind processing ceramic cylinder sleeve Nei Yuan hole, make the toughened zirconium oxide ceramic composite cylinder jacket of φ 170～180 * 400mm.