Prema, R.

Udupa, H.V.K.

Vasudevarao, P.V.

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GOVERNMEflrr OF INDIA, TffE PATENT OFFICE, 214, ACUAHYA .TI.CAl)ISHBORERt*D, 'CALCVr.l.17. Complete Spec1fioat:fon "0..142016 tlAteQ21st July 1975. Appl:fcatlotl No.11..17/Cal/197' dated 21st .1uly1975. ["Divided out of No.74?'J.?2 (Sel"ial 1(0.137763); Ante-datedto 4th JUly 1972J. Aceeptance of the eO_lete speoificationadvertised on 21st May 1977~Index et aeoeptance- 1'4D2L.-LVllf(1)J188L-XXXIII(9 )JInternational. classification· .. B 41 \1 ,/02...H 01 f!II 23/00ttDlPROVTJ-fEtfrS 1M m RBIATING TO THi fR(I)'OO'rION (FSINl'ERJm JofATRICM US., Ilf ALKALINE BAT'l'KR!E8"OOUNCIL OF SCIS1f1'IFIC lID OOU8TRIAt~SlUOHt Ral"! MnrgNew Delbi-1, Ind1a~'and Indian repistered bod,lneorporntedunderthl! Registrat10n or Societies Act (Act XXI of 1860)Tbetollowing speoification partioulerly describes andascertains tbenature or this 1nvent1onai1d the manner :1nwhichit 1. to b~ performed 1-Th1s 1. an 1m'entian b7 HA.NT~.IJYVI.mcATilKRI •• lJttUM.D:l.l"ector. PBNNAQARAMVYASAaAO VUtlJIYAMO, $c·i.ati., andI'ftEMlRlNGCRlTB .. 8«t:l.ol' laborato,", A"d.,tant. all of theOentral mectroehell1tJe:l Reeearoh Inlt1,tute, a •• ik'tld:1-6, 1'&11111(JadU. India. all lnd1an citizens.PRICE ·.iI .2,; O@''"11.8 i....ntion ntlat.. to ~Mln~ov... ft't. in or r(\latt...,te tl_ pt"Odu..,tiOll or III int.red lI4!l.trio. _ tt.... lit alkaltMpar";!"".'" ara4. .., ,.O~·inllltane. earboay 1 Riek.l powd.1".t,~ ••art.ty, at. IIJtdtabl. _",~r.tut". in .. h.,.41'0".ftaie t ..... te obJoot1011 that tiki. requir •• a l.... ',... ot ... r.tC1ll1ar era"., .and tho ,.••• f' atollel a1...l.c...... th•••• t •• aJ.lth .... quit .... nt. or aiobl .....4"':(1'1•• 1tt •••..,.It... ,.... tkat 'Iii.. .u be do.. 'by •• .1~.I l_ aiek.l propar.d by the pro ..• '. (Setial 1'40.137763)b'~" •• - ... eU.. XIulian Pat.nt applioatioD ".T""f7~ ...~"J.r alo •• or ta __ 1St11" witb otb.1' .. tal po .,...• 'latori .. to &, nlcal, niokel pl 01 .uitably 1'0.I'1ILt ••• be.t or wi ... Mt. Th•• 1ntorod _trio •• (pi ·)o1Dta1a04aro touDd to b. cC)~ar.bl. to tb. OD.. obta''''with nick.l powdol' aloae.ACOOrelitlg t. tbll PI"•••• t l.IrY.l1tlon. tho.... i •• ,...;1.-II> .... 0 ••• to.. tit. pl"04uott.. or .tat.l'" •• trio ••• uit •• la1:'0'-ua. 1ft alkali .. b.,to ...i•• _yp iq pur. atok.ll>ovdar. and .int..riAe the p...... ct D in aft atllO;.pbo........ di •• oct.t." S-. 01' lI.,.rop. ehara.tort •• eI ilL 'ha'c-.po.i .. a.oke1 p r p....pared .econU.nc to ,ho pr .....of' OU1" prior ID4t_ pat •• t "0.1'71" (141/72) ta thero'1Plyadltlixed with the pure niok ..1 powder •••••• in thlllratio(.f r:.:l t.., 2 by v.i~.t, prfor to pr.aeslnc ao4 ai»tart1lfh- 2..--".. 0 1.. at•• l ......... ts.. with 1po"r , •• it r at."I, 1l1.k.l Itl 1 rift... h 01' aick.lplatect 1 .tri••, d ,.o"tab • ......... ooapact •.. pr•••un .t 8.' t. 5 1....- •... ,.N .M to•...... lac tho a:tn. ""1'., ftr.bI7.t • pr......• t1.' '.na p.r .q........ t.riDe •• ,. 'b. ott••"" ....... 900 •• 1000-0....-rot... bl,. at ,,. ...1tIa., :WI. • ..... 1.........1' .a,. _ -..s••wt1da .atok.l powderp"t.ra"'l,. 0Vb..,.1 .t....l ..ftti. ot 0.2 to a ..,. -tala••"aa1 pro.ortlt...• t ...... 1......... _ea.l .......are pr.t.rabl,. _pl.,..d, ••• • 001'. _t.rtalor tit.. l_asld. t. •••d tor tk. pre.... ti.. 01' ...... tt. ~.kel.... a:tokel •• ~ i. pr.t.rabl,. 0.' ",,.welp. 01' ••...... t•• powd.r vhaa •• 0081'•• 1.. p..... i. pr ...... ,d:tlh•'fIae•• apo.lto atolt.l po......r "als" witll atek.1pOWder1•• 1,t.ct ",.rat.k.l •• tokel pl 1 wu._ah .r alobl pl.t.d punebed.te.l .trlp., .'!'be .olDPOa1ta aDd pur4l nt.... l ..... 1'are ala" .....1... 4 thorouch17 ... a .utt.bl. alx1.. _ohi tthe __ et powder obt.i.d1. UDi1'ont allllft tt ............ a"_ct powder 1•• ttt'" atebl .li....•t••l _ell alo_l .,. 1 tp. or •'~t:twor.1JIc ",-,.trah. ...'1 .'1•• b:tuaa4~·........... MIIId,lH ..,~ pra ..1i---3-materbl disintegrating. The pressure used for such apr ••• illg :18 bet •• e. 0.5 to 2T/cm2 and prQ1'erably 1.'5T/cm2•Tholt prlU!l81l!1dfl'mter:l.nl ;i" then kept OVer er.~phite support.1U\I!1nh-'olluced 1n a fUrnaoe under an ntmoephere of'b:ydrogen or dissociated QlIlIIIonia and 8intered at a tempe.ra-I~ur", betweon 900 to 10000C pref'erably at 9!)00C.1~he tillle f'or such a sint.ring :IlilJ between 10 minutesto 1 hc)ur pret'erably for )0 m:l_l1ut8S.,]~he resistiVity 0'£ the sintered conrpnct, was .30 x 10-Gom. Cm COMpared to around 20 x 10..6 OUM em for pure nickel.nt,,, pox'o.ity of the sintered compact wae 66" oOlllpared to65" obileined f'or "i.ntered matrices obtained f'or pure niokel.TIlEll aililteJ".d Matrioes obtained with a ftlixtu:re of' compositeniClkelpovder and pure nickel powder wa. i'ound to be a8re!det81:r1t to ch.mioal attaok, aa well a. comparable 1neltlctrclcliEltbioal properties to pure nickel in )0" pota •• iW'llbycllro.a:l.,Je which is usually u.ed .a the eleotrolyte in alka-1':le sintered matrices obtainod ,,'ith compoeite nickelpOllder I)xhibite the 8ame chain like structurE'l a8 that obtain-ed f'ruml P\llre carbonyl nickel powder used 1:11the conven-'Ihe saVings in niokel by uee of' 8 mixture of' oompo..8i1::ean,.l Il,ure niok.l powder ... ount. to "to 'O~ by weight.Example-IC,>re' material of' theCt)mll,oaite powd.rCIU'bonyl niokel powder • •Titanium oxide7' micron (-200mesh)2T/crn2• •P':re"",ure " .R~tj.() of' oOlllpo81 t. to111'111'.' n1<=1<81 powderIlilnhring t.... ra tUJ:'.A.tMclspheroD!'U-illltion of' sinteringI'i)rculity of' the aint.red•• 11'10••lil •• tattv! ty11 'I• • 9~·Cer.oDd .... oaia)0 ..ts.• •·.·.. 6&")0 ..2 2 10..6 omc em.••Clor•• aterial ot the<eonapo.itapOlfderOarbonyl nIckel J')O"W4IerPre.eura••Graphite po......'06 .1croa (-"0 ...h)7' _1erOD (.1200 _eh)o.,T/_'• •••Ratio e£ co.poeita topur. nickel. powderStntarine t.mpe~tnr.AtlaoephereDuratioD of elftt.r~Por•• it,. ot the.lnt.r.d .atrI0••R.eiet!...-it,.•• 111••••01"llcbd .Aa8oll.i.20 .tnu_•••• 17"2t Jt 10-' (Mo. ..••The t ntl0. 4••orl_. tbet _rmer bl whtCh ..o \. ~ tli..o,_ \ ~ 3(.1tit te atokal powder procluoe.aoeord bas to.lPateat IfoeJtlt'7lff1) t."lze<l vlt1l pure uokal powder anet .ia_n4 t. obt ...._trio •• auitabl. tor u•• bPt .!a...... dobl .... .t..batt.rie. aDd co-,pU'&'bI. to _llrteo a .tatlM4 .i'tJa p\II"ltaJI.ok.l powd.r tb ...... ,. aocountiria tor .. _.1..• 01' :so '0 .,•... il....OOD~'t •• ot IIt.kel, ........ r. CeMp•• 1f~o D::I.O_J,.~rC},.,.~ \,,(131761(, .prep ..... ta .. mana.r d••• rlbe4 lft~;P.'.D'.~57172J,1...-.lxed -.i tb pur. oarbOD1'1 "ok.l powder la .. r ...... .......,.1..1t••b •• 1t 0.2 to '2 'b,. .. 1"" aDd .iClI.d GTeI:' .. nlo-'1, aiclle1,.1 •• " 0'••1, ..,.,..... or punohtHI.t Spa 4 la ...F••• at .. pr. ••ure of' 0.' to 2T/••' aDd .tDt 4 ill •:t'U:.'.a.e in ,an atao.phere ot'hydro .... or di t r _u.nt .. t_p.r.turebe ........A 900 to 1000·0 '-taUt •• te....1I .... rio.. v1:t11propertl.. at.j.:lar to *. o.eo • ., ..U.C wi.1_8 Diokel ....... 1".'!be .. 1Jl ........ ,... .r .lll0 in't"•• tloa .:r.C 't) tMo<n........ t:l.•• 01: Mck.l ..,vd.,. :I. br(.u....t do.... "0 6, t. ,..i'1)I"~ue .... tIJ.-tered plato. tor .1k&1lM 'batt.rt •• fa)/"o;"n_ u.. .. 1"1'.1 fo. .'1" 10W' j;~ ..w4d'8tlt 01' .tat d _tr,j, •••• re 1 ttIaa t_t ...:1:lhptrr. aio.l vi I"'.$;.. _ 0."1" ,.. rtt•••1. A pro.... tor the production ot .intO"" .a1:r:1o••wita"l. t'or ..... In alltaliDe batt.ri •• by pre •• 1ft. pure .tok.1powder. and .tnt.riA. the pr .... d. er-ea ba .a atlltO.ph.n ofdi••ootated. a-.onia or hydr •••n oharaot.ri." tn that OOM-po.ita nickel powd.r pro pared .ooordtnC to the prooo•• of'our prior l:Ddiaa Patoat "."1'7" (747/72) b Maoroach1y.-iseel with tho pu" a1.01 pcnrder, • •••• 1a tho ratto of'0•• to II by wetabt. prio:t- te pro•• tate aM .:l.t.r~.I • .l proo••••• old,*" 11& olda f "':re1n the oOllpo~,.1_ n!ekel po.......r eeI.b: .. lIfUhpV. a1oke1 powder 18 .1t'ted"'.1' alek• .l.. alokol pla'od 1 o. 'IItr.... h or aiolt.l·pl.'6ee1 panoh.« .' •• 1 .tri;pe, pre •• ed to obtaJ.D" pre••• d.... eet.,. A pro._ lataed t•• lata 2 wIt.NUt a .,........re.f 0.' t. 5 t.ft./.ca 1.... 4 tor pre"", the au" po.,"_. A pro.... _ .lat.... ill 011.. , ....... 1. Id.... rtft.t.a .1":ro."d bd"M.a 900 t. 1000·0 UIll ... U'orably at 930-0.,. A p:t-oOlt elallM4t i. ol.ia t t"o o.apo ..,'.i ... PfI'Wll." 1. odai:lted ih pure llloJl:ol po r pre,.rab1,."ar.boayl Iliobl pc_.t" in tho ratl .• '5' 0.2 to 2 b,. "eipt.6. A pro •••••• old ••• ill o:a..t• .5 .eroio oqual.1;t... porU,o,ua of' o08lpOei" aJ:ld pUnt al0ke1 powder are .-p1o,.e4,1,tbeSS • oore _wrial ot ttt:aDJ\1aoxide 1e ..... d t'or ~. pr.pa~.,.. Apro••• a. 0.1.1.-'1* clat. 5 vhel'8:la pare:ni«k.1 u.ed is 0.' by .. :a..llt of' 1:'" coapo.it •• pewe!.r. whellthe' c:owpo.i.t. powder io produeed vJ.th the COrti •• 'tOrial8. A pl'oC••• ~or the "JlUf'act~ 'Df' ,,:iht,u· .. d .. triCflf'for a1kall.ae batteri •• aub.tanti,al,]y Ills her",.tn baf'oTW 4•• or1n'S/l;..n"1:Mthhl ;:I!ttlil.de,. oC .lilly, 1975UPI'l(C.1' & tl.C.I)(79-8t:)/150 ; ~~~ __~.• Pa~.nt.OfficerIt. 1 n..ev'chCouncil of' !3oient:U'ie lIlw.'f .n/tus.r.lI-- b .-

Improvements in or relating to production of composite nickel powder for sintered matrices used in alkaline batteries

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